Support ARM64 architecture.

[mdgreenwald]

Currently the mozilla-sops-action is hard-coded to download the AMD64 binaries of the Mozilla/Sops project.

mozilla-sops-action/src/run.ts

Line 27 in 67e083c

return util.format('https://github.com/mozilla/sops/releases/download/%s/sops-%s.linux.amd64', version, version);

mozilla-sops-action/src/run.ts

Line 30 in 67e083c

return util.format('https://github.com/mozilla/sops/releases/download/%s/sops-%s.darwin.amd64', version, version);

With the rise of general ARM availability there is potential for the mozilla-sops-action to be run on an ARM instance. Currently if this were to occur, it would fail. Therefore it would be good to future proof the action for this scenario.

[moshest]

I'm also needing this.

The action can automatically select the right binary using the runner.arch context variable.