feat(docker): add arm64 images

[sirchnik-xitaso]

Description

arm64 images are currently missing in dockerhub mnestix. arm is often cheaper when using at cloud providers.

Unfortunately yarn install is taking ages with qemu/arm64 so there I had to add a caching step for building the arm image. If you don't want this complexity I could remove this but I thought faster pipelines even for deployment are always good.
Successful run
Successful build

Type of change

• Minor change (non-breaking change, e.g. documentation adaption)
  I could not thoroughly test this because I didn't want to hassle with dockerhub but merging this to dev and looking if the image is present then should be enough.
  If not it would be a bit of effort.

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix or my feature works
• New and existing tests pass locally with my changes
• My changes contain no console logs

[sirchnik-xitaso]

DRAFT again: Github does not allow secrets to be used in PR from forks and of course inside forks. 😢

[sirchnik-xitaso]

For an open source project it would be good to not rely on external secured services so there is now a docker internal.

Allowing both would be too complex and the internal one isn't that slow as the slowest piece in startup is still the aas-environment.

[pawel-baran-se]

good point :)

[sirchnik-xitaso]

The Basyx Realm didn’t work for me, so I created a simpler Mnestix Realm instead. With this setup, the tests work, and it makes integration with an existing Keycloak instance easier. Additionally, it helps document what Mnestix requires in Keycloak. If this redundancy is unnecessary, I can remove the file again.

Not working

I think one problem is that there is an "role" property and it should be "roles". At least it works with "roles" for me. 

.