fix Dockerfile Go version

[dogancanbakir]

fixes #724 - update Go version from 1.21.1 to 1.24 to match go.mod requirement

Summary by CodeRabbit

• Chores
  • Updated container base images to newer Go and Alpine versions for improved compatibility, security, and performance.
  • Configured the container to start the application automatically by defining a default startup command.
  • Bumped the displayed application version to 1.3.1 (updated banner/version shown to users).

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[coderabbitai]

Walkthrough

Bumped Docker base images and set an ENTRYPOINT in Dockerfile; updated the package version constant from 1.3.0 to 1.3.1 in internal/runner/banner.go. Lines changed: small, focused edits across build config and a banner/version constant.

Changes

Cohort / File(s)	Summary
Docker Configuration Dockerfile	Builder image updated from golang:1.21.1-alpine → golang:1.24-alpine; release image updated from alpine:3.18.4 → alpine:3.23; added ENTRYPOINT ["cloudlist"].
Banner / Version internal/runner/banner.go, go.mod	Bumped exported/static version constant from 1.3.0 → 1.3.1. go.mod touched alongside version bump.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐇 I nudged the Go and Alpine high,
A tiny hop — a newer sky.
Version bumped, the banner sings,
ENTRYPOINT set for brighter things. 🥕

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The PR includes an out-of-scope version bump from 1.3.0 to 1.3.1 in banner.go that is unrelated to the linked issue #724 about fixing Docker build failures.	Remove the version bump in internal/runner/banner.go or link it to a separate issue for version management, as it is not required to fix the Docker build failure.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix Dockerfile Go version' clearly describes the main change: updating the Dockerfile's Go version, which directly addresses the primary objective of fixing Docker build failures.
Linked Issues check	✅ Passed	The PR successfully addresses issue #724 by updating the Dockerfile Go version from 1.21.1 to 1.24 to match go.mod requirements and fix Docker build failures.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

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