DRAFT: Enable Air-gapped open-balena deployment

[compiaffe]

DRAFT This MR enables air-gapped installation of open-balena

This very much builds on https://forums.balena.io/t/supported-devices-in-open-balena/357665

We have this working in production. I would appreciate feedback on how to best integrate this into open-balena. I expect there a changes to be made. My bandwidth is limited, so don't expect this to go fast.

Overview of changes:

• Add a docker-compose-airgapped.yml
• Fix dependencies in containers such that they do not run apk add or equivalent during runtime
• Add (gitlab and currently on our gitlab repo ) cicd to build all containers, rather than relying on docker compose build
• Add a api-contracts container which contains the contracts github repo and bind mounts into the api container as a CONTRACTS_PRIVATE_REPO_...
• Add a s3-device-types which contains a subset of the s3 bucket and pushes this into the s3 container (this is still on our repo solely for cicd ease of use, will move in here)
• Fixes to the env.tmpl file used by the api container to respect a few more env set in docker-compose (e.g. DEVICE_TYPES_CACHE_LOCAL_TIMEOUT to fix a caching problem)

[ab77]

@thgreasi @dfunckt @cmfcruz you may want to take a look at this PR, there are some good ideas in here, which can be potentially distributed/incorporated in the relevant repos to make it all work