Streamline Maven Builds and CI

[ThorbenLindhauer]

This issue was imported from JIRA:

Field	Value
JIRA Link	CAM-11968
Reporter	@ThorbenLindhauer
Has restricted visibility comments	false

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Let's make modernizations and simplifications in our CI and Maven build structure in order to

• Reduce occurrence of build instabilities
• Reduce infrastructure maintenance efforts
• Increase PR build coverage
• Reduce the risk of introducing build regressions during development ("build regression": a change that creates an issue in a release build or similar that we will only notice much later)

Please create sub-tasks for individual items

Breakdown:

• CAM-11970: Create a single build that produces all core snapshot artifacts
• CAM-11971: Consolidate Maven profiles
• CAM-11972: Make platform build succeed without extra Maven settings
• CAM-11973: Re-evaluate authorization builds
• CAM-12396: Update CI to latest Maven version

Links:

• depends on https://jira.camunda.com/browse/CAM-11969

[ThorbenLindhauer]

This comment was imported from JIRA and written by user L3xJbNX

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I would create an additional task for upgrading the maven version: the maven version that we are currently using is quite outdated. Newer version are better suited for cloud environments since they implement more robust ways of handling connection resets/retries (see https://stackoverflow.com/questions/42024619/maven-build-gets-connection-reset-when-downloading-artifacts).
I see https://jira.camunda.com/browse/CAM-11822 is related to adapting the code for the new maven version, but there is nothing mentioned about actually upgrading the code.

As we go in this direction, build parallelization becomes more and more important to avoid very long build times. That's why I would also suggest adding https://jira.camunda.com/browse/CAM-11210 to the list.