ci: Migrate CI from Drone to GHA

[PierreJeanjacquot]

This PR migrates the repository CI from Drone to GHA

Notable changes:

• conventional commit enforced on PR
• releases created by release-please
• releases split by component
• docker rolling tags latest, vx and vx.y dropped

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[Copilot]

Pull Request Overview

This PR migrates the CI/CD pipeline from Drone to GitHub Actions, implementing component-based releases and modernizing the build process.

• Replaced Drone CI with GitHub Actions workflows for PR checks, staging, and release automation
• Introduced release-please for automated release management with conventional commits
• Restructured Docker builds to be component-specific (api and watcher) with dedicated Dockerfiles

Reviewed Changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
.github/workflows/	Complete GitHub Actions workflow setup for CI, PR checks, and automated releases
release-please-config.json	Configuration for automated release management with changelog generation
watcher/package.json	Removed CI-specific test scripts that used containerized hostnames
api/package.json	Removed CI-specific test scripts that used containerized hostnames
watcher/Dockerfile	New component-specific Dockerfile replacing shared build approach
api/Dockerfile	Updated to use correct paths after removing shared build pattern
CHANGELOG.md	Restructured to reference component-specific changelogs
.drone.yml	Removed legacy Drone CI configuration

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