chore: extract of improvements from #415

[lemeurherve]

This PR is the extract of improvements from #415:

• Add init, buildall and publish make targets
• Use init, buildall and publish make targets in the Jenkinsfile
• Bake target as first arg everywhere
• Variabilise JDKs to build in docker bake
  • Third consumer introduced in chore: use docker bake to generate docker compose file #415
• Small Jenkinsfile improvements
• Small build.ps1 improvements
  • Fix to a typo around TESTS_DEBUG introduced in chore: improve Windows tests debug and small code cleanup #396

Ref:

• chore: use docker bake to generate docker compose file #415 (review)

Testing done

Submitter checklist

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• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[lemeurherve]

Closing in favor of distinct pull requests:

• chore: define jdks to build at a single place in docker bake #419
• fix: implement docker calls as make targets #421
• fix: correct TEST_DEBUG retrieval in build.ps1 #422
• chore: improve env var scopes and retrieve VERSION in build.ps1 #424