Remove Setup-Go

[StevenACoffman]

Per discussion in #365, this removes setup-go dep.

Until this PR is landed, we are stuck and unable to upgrade any dependencies, fix any vulns, due to the inability to build the setup-go package.

So now we remove it and then we will need to explicitly install go, like:

    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-go@v2  # <-- here
      - name: golangci-lint
        uses: golangci/golangci-lint-action@v2

Of course, it will then require us to bump v3, but I imagine there are further documentation changes required so I am not doing that in this PR.

Signed-off-by: Steve Coffman steve@khanacademy.org

[SVilgelm]

Thank you very much for this PR, it looks good to me. Just one note: please update all examples in readme, add the go installation step. I need few day for testing.

[kamilsk]

great

[SVilgelm]

• add go installation step in all examples in the README.md file
• remove skip-go-installation option from action.yml and from README.md files
• Add a note in the readme that v3 requires explicit go installation step

[SVilgelm]

Here is the PR I use for testing the changes for this action: sv-tools/mongoifc#49
everything works fine so far

[StevenACoffman]

I think I have now corrected the references you mention, but please let me know if additional references to setup-go are present, or if I should make any further edits.

[magnetikonline]

Thanks for doing this work @StevenACoffman - great to see it finally in the new @v3 action. 👍