♻️ [CI] Improved Kapua CI workflow artifacts and dependency caching

[Coduz]

Improved the way and what gets cached as dependencies and built artifacts in used GitHub Actions workflows

Related Issue
None

Description of the solution adopted
Instead of having a cache per-build, which means that for each run we are downloading all dependencies for a job (unless restarting the same job), we switched to have 2 caches:

Cache for external dependencies

Named Linux-maven-{branchName}-dependencies, which will cache all .m2/repository but the artifacts under .m2/repository/org/eclipse/kapua.

This cache will be per release branch/develop and can be reused by all workflows and for all branches that start from a release branch or develop.

A TODO is to have this cache have a time reference, like {year}-{month}, appended to it to make it rebuilt from time to time with updated dependencies.

Since filtering with exclude paths for action/cache is not working properly (see actions/toolkit#713), exclusion is made by moving the folder outside of the maven repository.

Cache for built artifacts
Named Linux-maven-{github_action_run_id}-kapua-artifacts, which will cache Kapua artifacts built during the run. This cache will be reused by all job from the same run test and other tasks

This cache is restored and then moved to .m2/repository/org/eclipse/kapua directory so it can be detected and reused by Maven

Benefit of this are:

• External dependencies are not download for every build.
• Cache size for each build is ~500MB for each run for built artifact and one that gets reused by all workflows of 400MB with external dependencies.
  • Before, cache entry for each build :
    
  • After, cache for each build + common external dependencies cache:
    
• All workflow have a unique cache for external depedendencies. Before we each workflow had its own cache key:
  • Sonar: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
  • Owasp: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }} but JDK setup was enabling cache, duplicating it
  • KapuaCI: {{ github.run_id }}-${{ github.run_number }}-maven-cache

Screenshots
None

Any side note on the changes made
Some clean up and optimization of jobs and action has been done to simplify management and avoid duplication of common parts