improve CI workflow timing

[Marketen]

Improves CI workflow and Docker build process to optimize dependency caching and reduce build times.

Main changes:

• cache Yarn uses in main and npm workflows
• Reestructure Dockerfile to enable layer caching

CI workflow improvements:

• Enabled Yarn caching in GitHub Actions by adding the cache: "yarn" option to the setup-node steps in both .github/workflows/main.yml and .github/workflows/npm.yml, which helps speed up dependency installation in CI runs. [1] [2]

Docker build optimization:

• Refactored the Dockerfile to extract only package.json files from each workspace into a separate build stage (manifests), allowing Docker to cache dependency installation layers more effectively.
• Updated the build stage to first copy only dependency manifests, run yarn install --immutable, and then copy the full source code, ensuring that dependency installation is only re-run when manifest files change, not when source files change.

[github-actions]

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