Restructure the supervisor image to remove the dependency on the custom `alpine-supervisor-base`
image and the custom node build. The dockerfile is now a multi-stage
build that splits the process into two build stages and two runtime
stages.
Here is the full list of changes
- The node binary is now copied from `balenalib/${ARCH}-alpine-node:12-run`, the node binary
now supports running with a debugger.
- The runtime image now inherits from the official `alpine:3.16` image
- Tests are ran within the runtime image configuration instead of the
build image
- Livepush is ran within the runtime image context
- Unnecessary packages have been removed
- Removed avahi-daemon.conf as that service is not being used
- Fix livepush to work with a multi-stage image. This also deprecates the `image-tag` argument to npm run sync as
`SUPERVISOR_TAG` is no longer used by new OSs
- Fix livepush build on old rpi devices. Allows passing a 'PREFIX'
argument to let the builder pull images directly from docker hub arch
repositories. Relates to https://github.com/balena-os/balena-engine/issues/269
Change-type: patch
