feat: Unify containers

[daler]

This addresses https://github.com/bioconda/bioconda-containers/issues/74#issuecomment-1934528159 by unifying all container builds within this repo, driven by a single bash script.

• the dependencies among containers to be more formally declared
• containers are built the same way with manifests containing multi-arch images
• lots of comments to make it easier for the community to maintain over the long term.
• tests use any images built during the CI run, falling back to quay.io if none were built
• everything is in a single GitHub Actions workflow, build-images.yml
• an additional build.sh script is provided for local development

xrefs:

• https://github.com/bioconda/bioconda-containers/pull/71
• https://github.com/bioconda/bioconda-containers/pull/75
• https://github.com/bioconda/bioconda-utils/pull/951
• https://github.com/bioconda/bioconda-containers/issues/74
• https://github.com/bioconda/bioconda-containers/issues/64