Chore: incorporate Q-Gate Review

[tom-rm-meyer-ISST]

Description

Fix findings from QGate:

• solves TRG 7.05 Legal information for distributions for backend #388 (added legal files to backend)
• solves TRG 5.01 Helm chart requirements #387 (imagePullPolicy, uniqueness of templates and resources, empty tls by default for ingress, remove fullnameOverride -> did the last for all in values.yaml)
• solves TRG 4.06 Link docker image in docker notice #386 (linkage of notice)
• solves TRG 1.02 Add information about how to install released chart from TX chart repository #385 (INSTALL.md to use repo, outsourced rest to development doc)

As I was already in the mood:

• enhanced CONTRIBUTING.md a little
• Changelog: added limitation for security + fixed links
• Docker Builds:
  • don't maintain legal files as duplicates (Legal Documentation and Dependencies file #49)
  • add arm64 platform support

Pre-review checks

Please ensure to do as many of the following checks as possible, before asking for committer review:

• DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• Copyright and license header are present on all affected files

[tom-rm-meyer-ISST]

Hey @evegufy, created a PR that tried to address nearly all findings including recommendations (helm restrucutre not yet included). I also added the arm64 architecture and it seems that in the run there is an issue with dependent libraries. Did you maybe also face something similar?

We're using a separate npm task to perform a build for docker.

[evegufy]

Looks really good in general!

Just some comments:

• I attempted to execute a helm upgrade and noticed that you currently need the set flags from here for that to work...
  if you just add empty"" here and here as value you spare those set flags. I really recommend to change that, otherwise executing an upgrade is not intuitive.
• please also name the secret for the postgres dependency more uniquely https://github.com/eclipse-tractusx/puris/blob/2.0.0/charts/puris/values.yaml#L501, for instance secret-puris-postgres-init

[tom-rm-meyer-ISST]

Additionally did the following:

• add frontend license information replacement
• multi platform (needed to use a prebuild workflow
• updated the name for the postgres secret

Thanks a lot @evegufy for supporting me on this!