Read default version to go.mod version if present

[stevenh]

It would nice if the default version could be discovered from the repo's go.mod version if present in the same vane as go-version-file for action/setup-go

steps:
  - uses: actions/checkout@v2
  # Installs version 1.26.0
  - uses: bufbuild/[email protected]
    with:
      go-version-file: go.mod

[emcfarlane]

Hi @stevenh , the new buf-action is intended to address many of the issues with the previous set of actions. This feature however isn't currently supported. Please see the version docs for supported configs. Closing for now.