Migrate docker build CI pipeline to kaniko + crane / manifest-tool
This should speedup pipeline a lot and elevated permissions shouldn't be needed (no privileged runner).
Every architecture would be built separately in other job matrix variable.
Additional pipeline after docker build would tag branch image and push it under tag. This also allows to test image building on merge requests and coould potentially allow to deploy merge request's docker images locally.
https://github.com/GoogleContainerTools/kaniko
https://github.com/estesp/manifest-tool
https://github.com/google/go-containerregistry/blob/main/cmd/crane