Partly revert and enhances #115
This is a follow-up to #115 that replaces the hardcoded `summerwind` portion of the image name with `${{ github.repository_owner }}` to enable contributors to test the image pushing behavior and fixes image building by conditionally passing `--push` to the build step based on the event that triggered the workflow.
After setting the `DOCKER_ACCESS_TOKEN` Secret on my fork of this repository, I was able to use this updated workflow to [build and push](https://github.com/urcomputeringpal/actions-runner-controller/runs/1242793758?check_suite_focus=true) a [set of images](https://hub.docker.com/r/urcomputeringpal/actions-runner/tags) and confirm their functionality. I imagine this will be useful to future contributors who wish to help with the chore of keeping up with https://github.com/actions/runner/releases.
Adding multi-arch image support for `arm64` and `amd64`. This uses dockers new `buildx` feature, to enable further architectures more work will be required to update the `runner/Dockerfile` file to pull architecture-specific releases.
The Makefile targets really should only be used for local testing and not for release, additional work to appropriately tag the release images may need to be added but for now, I've not added that logic.
Fixes: #86
Signed-off-by: Michael Fornaro <20387402+xUnholy@users.noreply.github.com>
