Retrieve go version from go.mod file

Description: Instead of hard-coding the go version, the action could (optionally)

• search in the root of the project (or in any other configurable place) for a go.mod file
• extract and use the go version specified there.

Justification: Justification or a use case for your proposal.

Are you willing to submit a PR?

[TMaYaD]

FWIW, this is the workaround I use:

      - run: sed -En 's/^go[[:space:]]+([[:digit:].]+)$/GO_VERSION=\1/p' go.mod >> $GITHUB_ENV
      - uses: actions/setup-go@v2
        with:
          go-version: ${{ env.GO_VERSION }}

[IvanZosimov]

Hello, @pantelis-karamolegkos 👋 Thank you and all others for contributing! We are closing this issue because this PR has been successfully merged. If you have any questions or additions feel free to ping us.

Cheers!