Add multi platform build for Docker image

[politician]

This adds support for Mac M1 (and other arm processors)

[rhysd]

@politician Thank you for adding this. How did you confirm this change worked? Since I don't have M1 Mac, I cannot verify the change.

[politician]

@rhysd Sorry it wasn't working due to Shellcheck arm64 not being present in the Alpine repo (?). I have modified the Dockerfile and repushed.

• Docker Workflow running successfully on my repo
• Image built on my Docker hub
• Running it on my Mac M1:

[rhysd]

@politician Thank you for checking that. From your screenshot, it fails with YAML parse error. In the case, shellcheck is not run. Could you confirm the copied shellcheck binary works fine in the built image? Since only /usr/local/bin/shellcheck is copied, it may not work if it depends on some dynamic link libraries at runtime.

[politician]

@rhysd in the ShellCheck Dockerfile, they do the same copy operation

ShellCheck works:

[rhysd]

in the ShellCheck Dockerfile, they do the same copy operation

Oh, ok, then it should work (with all dependencies being statically linked?). Thanks for the confirmation

[rhysd]

@politician Thank you! Merged.

[rhysd]

actionlint v1.6.15 was released and now linux/arm64 container is available.

https://hub.docker.com/layers/rhysd/actionlint/1.6.15/images/sha256-f63ee59f1846abce86ca9de1d41a1fc22bc7148d14b788cb455a9594d83e73f7?context=repo