buildx: cache binary to hosted tool cache and GHA cache backend

[crazy-max]

When installing buildx, downloaded binary is not cached. As public GitHub runners are ephemeral, this can take some time to download the binary for each workflow execution: https://github.com/docker/setup-buildx-action/actions/runs/5462992694/jobs/9943119048#step:3:1

And even more if building from source: https://github.com/docker/setup-buildx-action/actions/runs/5462992694/jobs/9943110665#step:3:1

With these changes, binary will be cached to the hosted tool cache like the official actions do today with node, go, ...

This is fine for self-hosted runners but not public runners as hosted tool cache is pruned when a job is completed. To solve this issue, we also cache the binary to the GitHub Actions Cache backend.

[crazy-max]

@nicks This can be an alternative to #127 if you want to make some tests on your side. This does not require changes in setup-buildx-action. Just vendoring this actions-toolkit branch.

[crazy-max]

Tested in docker/setup-buildx-action#245

Build without cache: https://github.com/docker/setup-buildx-action/actions/runs/5473103624/jobs/9966137055#step:3:99

With cache: https://github.com/docker/setup-buildx-action/actions/runs/5473500347/jobs/9967061068#step:3:99

[nicks]

i like this approach! i tested it and it works for me - https://github.com/docker/gondolier/actions/runs/5476236490/jobs/9973479123?pr=381

i'm still having problems getting buildx to build from a tag though, see this failure: https://github.com/docker/gondolier/actions/runs/5476109857/jobs/9973172585?pr=381. The only way i was able to get it to work was to manually resolve the tag to a SHA.

[crazy-max]

i'm still having problems getting buildx to build from a tag though, see this failure: https://github.com/docker/gondolier/actions/runs/5476109857/jobs/9973172585?pr=381. The only way i was able to get it to work was to manually resolve the tag to a SHA.

I need to take a closer look at this one. Have you tried with #refs/tags/... ?

[nicks]

oh forgot to mention - i confirmed that #refs/tags/... worked ok