Create complete cloud-native-lab repository scaffold for CKAD/CKA preparation

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{yaml,yml}]
+indent_style = space
+indent_size = 2
+
+[*.md]
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab
+
+[*.go]
+indent_style = tab
+indent_size = 4
+
+[*.sh]
+indent_style = space
+indent_size = 2

.github/CONTRIBUTING.md

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+# Contributing to Cloud Native Lab
+
+Thank you for your interest in contributing to this repository.
+This guide explains the conventions, standards and workflow for contributions.
+
+## Naming Conventions
+
+- Use **lowercase kebab-case** for all directory and file names
+- Examples: `my-lab/`, `config-map.yaml`, `validate.sh`
+- Do not use spaces, underscores, or camelCase in file or directory names
+
+## Lab Structure
+
+Every lab must contain at minimum:
+
+```text
+lab-name/
+├── README.md         # Objective, instructions, validation, cleanup
+├── namespace.yaml    # Kubernetes namespace for the exercise
+├── resources.yaml    # Kubernetes resources (or split into individual files)
+├── validate.sh       # Validation commands
+└── cleanup.sh        # Cleanup commands
+```
+
+Refer to the [lab README template](../docs/templates/lab-readme-template.md)
+for the expected structure.
+
+## Validation
+
+Before submitting a pull request:
+
+1. Verify Kubernetes YAML indentation is correct
+2. Verify that selector labels match Pod template labels
+3. Verify that Services target the correct ports
+4. Run `bash validate.sh` from within the lab directory
+5. Run `bash scripts/validate-manifests.sh` from the repository root
+6. Run `make lint` to check Markdown, YAML and shell scripts
+
+## Documentation Expectations
+
+- Every lab must have a complete `README.md`
+- Every top-level directory must have a `README.md`
+- Markdown must pass `markdownlint` with the `.markdownlint.json` configuration
+- Use clear, professional English
+- Explain _why_, not just _what_
+
+## Safe Scripting
+
+- All Bash scripts must begin with `#!/usr/bin/env bash`
+- Use `set -euo pipefail` in all scripts
+- Scripts must not silently delete unrelated resources
+- Cleanup scripts must only delete resources created by the specific lab
+- Validate that required tools are present before using them
+
+## No Secrets
+
+- Never commit secrets, credentials, API keys, passwords, or tokens
+- Use obviously fake placeholder values such as `REPLACE_ME` or `<your-value-here>`
+- Kubernetes Secret manifests must use placeholder values only
+
+## Small Pull Requests
+
+- Keep pull requests focused on a single lab or feature
+- Do not mix unrelated changes in the same pull request
+- Add a clear description explaining the purpose of the changes
+
+## Proposing a New Lab
+
+To propose a new lab:
+
+1. Open an issue using the **Lab Proposal** template
+2. Describe the objective, target audience, and prerequisites
+3. Wait for feedback before implementing
+4. Follow the lab structure requirements above
+5. Submit a pull request referencing the issue
+
+## Commit Messages
+
+Use clear, imperative commit messages:
+
+```text
+Add multi-container Pod lab for CKAD application design
+Fix namespace mismatch in rolling-update lab
+Update kubectl cheatsheet with rollout commands
+```
+
+## Code of Conduct
+
+All contributors must adhere to the [Code of Conduct](../CODE_OF_CONDUCT.md).

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report a problem with a lab, script, or manifest
+title: "[BUG] "
+labels: bug
+assignees: ""
+---
+
+## Description
+
+A clear description of the problem.
+
+## Affected Area
+
+Specify the directory, file, or lab where the issue occurs.
+
+## Steps to Reproduce
+
+1. 
+2. 
+3. 
+
+## Expected Behaviour
+
+What should happen.
+
+## Actual Behaviour
+
+What actually happens.
+
+## Environment
+
+- Operating System:
+- Docker version:
+- kubectl version:
+- Kind version:
+- Other relevant tools and versions:
+
+## Additional Context
+
+Add any other context, error messages, or screenshots here.

.github/ISSUE_TEMPLATE/lab-proposal.md

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+---
+name: Lab Proposal
+about: Propose a new lab or exercise
+title: "[LAB] "
+labels: enhancement
+assignees: ""
+---
+
+## Lab Title
+
+A concise name for the proposed lab.
+
+## Objective
+
+What will the learner achieve by completing this lab?
+
+## Target Area
+
+Which directory or certification domain does this lab belong to?
+
+- [ ] CKAD
+- [ ] CKA
+- [ ] CKS
+- [ ] Kubernetes general
+- [ ] Go
+- [ ] Observability
+- [ ] GitOps
+- [ ] Security
+- [ ] Networking
+- [ ] Linux
+- [ ] Containers
+- [ ] Other
+
+## Prerequisites
+
+What tools, knowledge, or setup is required before starting this lab?
+
+## Proposed Structure
+
+```text
+lab-name/
+├── README.md
+├── namespace.yaml
+├── resources.yaml
+├── validate.sh
+└── cleanup.sh
+```
+
+## Learning Outcomes
+
+What will learners understand or be able to do after completing this lab?
+
+## Notes
+
+Any additional context, references, or considerations.

.github/pull_request_template.md

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+## Description
+
+Briefly describe the changes in this pull request.
+
+## Type of Change
+
+- [ ] New lab or exercise
+- [ ] Bug fix or correction
+- [ ] Documentation update
+- [ ] Script or automation improvement
+- [ ] Refactoring (no behaviour change)
+- [ ] Other (describe below)
+
+## Lab or Area Affected
+
+Specify the directory or area affected by this change.
+
+## Checklist
+
+- [ ] Directory and file names use lowercase kebab-case
+- [ ] README.md is complete and follows the lab template
+- [ ] Kubernetes YAML passes manifest validation (`make validate`)
+- [ ] Shell scripts pass ShellCheck (`make lint-shell`)
+- [ ] Markdown passes markdownlint (`make lint-markdown`)
+- [ ] YAML passes yamllint (`make lint-yaml`)
+- [ ] No secrets, credentials or real values committed
+- [ ] Cleanup script only removes resources created by this lab
+- [ ] Validation script works correctly
+- [ ] Links in README files are correct
+
+## Testing
+
+Describe how you tested this change. Include any commands run.
+
+```bash
+# Example
+kubectl apply -f namespace.yaml
+kubectl apply -f resources.yaml
+bash validate.sh
+bash cleanup.sh
+```
+
+## Related Issues
+
+Closes #

.github/workflows/go-ci.yml

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+---
+name: Go CI
+
+on:
+  push:
+    paths:
+      - "**/*.go"
+      - "**/go.mod"
+      - "**/go.sum"
+  pull_request:
+    paths:
+      - "**/*.go"
+      - "**/go.mod"
+      - "**/go.sum"
+
+permissions:
+  contents: read
+
+jobs:
+  go-ci:
+    name: Go CI
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go-labs/kubernetes-client/list-pods/go.mod
+          cache: true
+
+      - name: Find Go modules
+        id: find-modules
+        run: |
+          modules=$(find . -name 'go.mod' -not -path '*/vendor/*' | xargs -I{} dirname {})
+          echo "modules=${modules}" >> "$GITHUB_OUTPUT"
+
+      - name: Check formatting
+        run: |
+          find . -name '*.go' -not -path '*/vendor/*' | while read -r file; do
+            if ! gofmt -l "$file" | grep -q .; then
+              :
+            else
+              echo "File is not formatted: $file"
+              exit 1
+            fi
+          done
+
+      - name: Run go vet
+        run: |
+          find . -name 'go.mod' -not -path '*/vendor/*' | while read -r modfile; do
+            dir=$(dirname "$modfile")
+            echo "Running go vet in ${dir}..."
+            (cd "$dir" && go vet ./...)
+          done
+
+      - name: Run tests
+        run: |
+          find . -name 'go.mod' -not -path '*/vendor/*' | while read -r modfile; do
+            dir=$(dirname "$modfile")
+            echo "Running tests in ${dir}..."
+            (cd "$dir" && go test ./...)
+          done

.github/workflows/kubernetes-validation.yml

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+---
+name: Kubernetes Manifest Validation
+
+on:
+  push:
+    paths:
+      - "kubernetes-labs/**/*.yaml"
+      - "kubernetes-labs/**/*.yml"
+      - "certifications/**/*.yaml"
+      - "certifications/**/*.yml"
+  pull_request:
+    paths:
+      - "kubernetes-labs/**/*.yaml"
+      - "kubernetes-labs/**/*.yml"
+      - "certifications/**/*.yaml"
+      - "certifications/**/*.yml"
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    name: Validate Kubernetes Manifests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install kubeconform
+        run: |
+          curl -sSL https://github.com/yannh/kubeconform/releases/latest/download/kubeconform-linux-amd64.tar.gz \
+            | tar -xz -C /usr/local/bin
+
+      - name: Validate manifests
+        run: |
+          find kubernetes-labs certifications -name '*.yaml' -o -name '*.yml' \
+            | grep -v '.github' \
+            | xargs kubeconform \
+              -kubernetes-version 1.30.0 \
+              -strict \
+              -summary \
+              -ignore-missing-schemas