ci: simplify PR checks and release image publishing

[Che-Zhu]

Summary

• Replace the old PR check workflow with a main-only CI workflow that runs lint, tests, and build.
• Replace push/PR Docker publishing with release-only GHCR publishing for ghcr.io/fullagent/fulling.
• Make the runtime image workflow manual-only so runtime publishing can be designed separately.

Behavior

• PRs to main run code CI only: install, lint, test, build.
• PRs no longer build Docker images or post bot comments.
• main pushes no longer publish images.
• GitHub Releases publish the app image to GHCR only.
• Release tags must resolve to commits contained in origin/main.
• Prereleases do not update latest.

Validation

• Workflow YAML parses with Ruby YAML loader.
• pnpm lint
• pnpm test - 16 files, 57 tests passed; existing React act environment warnings remain in Sealos provider tests.
• pnpm build

[github-actions]

❌ PR Check Results: Failed

Build Checks

Check	Status
Lint & Build	❌ Failed
Docker Build	❌ Failed

⚠️ Action Required

Some checks failed. Please review the errors and update your PR.

Lint/Build Issues:

• Check the "Lint and Build Check" job for details
• Fix linting errors with pnpm run lint:fix
• Ensure the project builds locally with pnpm run build

Docker Build Issues:

• Check the "Docker Build Test" job for details
• Verify Dockerfile changes
• Test Docker build locally

Commit: 5a73a39121ca06e2c149b720c23eccf6f1c8eb1b
Branch: chore/simplify-ci-release

🔗 View Details:

• Lint & Build
• Docker Build

[LeoninCS]

very good