Feature/healthcheck - #122

.github/workflows/ci.yml

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+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Get Java Version
+        run: |
+          JAVA_VERSION=$(mvn help:evaluate "-Dexpression=maven.compiler.release" -q -DforceStdout)
+          echo "JAVA_VERSION=$JAVA_VERSION" >> $GITHUB_ENV
+
+      - name: Set up JDK ${{ env.JAVA_VERSION }}
+        uses: actions/setup-java@v4
+        with:
+          java-version: ${{ env.JAVA_VERSION }}
+          distribution: 'temurin'
+          cache: maven
+
+      - name: Compile with Maven
+        run: mvn -B compile --file pom.xml
+
+      - name: Test with Maven
+        run: mvn -B test --file pom.xml

.github/workflows/release.yml

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+name: Publish Docker Image to Github Packages on Release
+on:
+  release:
+    types:
+      - published
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v6.0.2
+      - uses: docker/setup-qemu-action@v3.7.0
+      - uses: docker/setup-buildx-action@v3.12.0
+      - name: Log in to GHCR
+        uses: docker/login-action@v3.7.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5.10.0
+        with:
+          images: ghcr.io/ithsjava25/webserver
+      - name: Build and push
+        uses: docker/build-push-action@v6.18.0
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64, linux/arm64
+          tags:  ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+

Dockerfile

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+FROM maven:3-eclipse-temurin-25-alpine AS build
+WORKDIR /build
+COPY src/ src/
+COPY pom.xml pom.xml
+RUN mvn compile
+RUN mvn dependency:copy-dependencies -DincludeScope=compile
+
+FROM eclipse-temurin:25-jre-alpine
+EXPOSE 8080
+HEALTHCHECK --interval=30s --timeout=3s --retries=3 CMD curl -f http://localhost:8080/ || exit 1
+RUN addgroup -S appgroup && adduser -S appuser -G appgroup
+WORKDIR /app/
+COPY --from=build /build/target/classes/ /app/
+COPY --from=build /build/target/dependency/ /app/dependencies/
+COPY www/ ./www/
+RUN apk --no-cache add curl
+USER appuser
+ENTRYPOINT ["java", "-classpath", "/app:/app/dependencies/*", "org.example.App"]

PortConfigurationGuide.md

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+# Konfiguration: port (CLI → config-fil → default)
+
+Det här projektet väljer vilken port servern ska starta på enligt följande prioritet:
+
+1. **CLI-argument** (`--port <port>`) – högst prioritet
+2. **Config-fil** (`application.yml`: `server.port`)
+3. **Default** (`8080`) – används om port saknas i config eller om config-filen saknas
+
+---
+
+## 1) Default-värde
+
+Om varken CLI eller config anger port används:
+
+- **8080** (default för `server.port` i `AppConfig`)
+
+---
+
+## 2) Config-fil: `application.yml`
+
+### Var ska filen ligga?
+Standard:
+- `src/main/resources/application.yml`
+
+### Exempel
+```yaml
+server:
+port: 9090
+```
+
+---
+
+## 3) CLI-argument
+
+CLI kan användas för att override:a config:
+
+```bash
+java -cp target/classes org.example.App --port 8000
+```
+
+---
+
+## 4) Sammanfattning
+
+Prioritet:
+
+1. CLI (`--port`)
+2. `application.yml` (`server.port`)
+3. Default (`8080`)