Feat: Support buildtime Secrets

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Description

Build Secrets are exceedingly important to fetch private resources and external dependencies.

Utilizing Build-Args or even Envs will lead to credentials leaked into the final docker image through it's layers and should be discouraged.

Docker provides https://docs.docker.com/build/building/secrets/ to provide secrets into build instructions

New or Affected Resource(s)

• docker_image

Potential Terraform Configuration

./.

References

• https://docs.docker.com/build/building/secrets/