Using SSH_AUTH_SOCK (ssh agent forwarding) to pull upm private repos

[ivan-hernandez-scopely]

Changes

• This PR is a proposal to fix this issue: Can't fetch private UPM Packages from github because can't add my github credentials to Unity unity-builder#161
• In order to get the SSH_AUTH_SOCK we used Advised usage for docker integration webfactory/ssh-agent#11
• sshAgent is an optional input parameter.
• Bonus: included also changes from Clf support upm ssh keys unity-builder#211

Usage

      - name: Setup SSH Agent
        uses: webfactory/[email protected]
        with:
          ssh-private-key: ${{ secrets.SSH_PRIVATE_KEY }}

      - name: Unity Test Runner (custom)
        uses: ivan-hernandez-scopely/unity-test-runner@feature/ssh-agent-for-private-upm
        id: tests
        env:
          UNITY_EMAIL: ${{ secrets.UNITY_EMAIL }}
          UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
          UNITY_SERIAL: ${{ secrets.UNITY_SERIAL }}
        with:
          projectPath: ${{ matrix.projectPath }}
          testMode: ${{ matrix.testMode }}
          artifactsPath: ${{ matrix.testMode }}-artifacts
          sshAgent: ${{ env.SSH_AUTH_SOCK }}

Checklist

• Read the contribution guide and accept the code of conduct
• Readme (updated or not needed)
• Tests (added, updated or not needed)

[github-actions]

[webbertakken]

Great work once again.

We'll merge this at the same time as game-ci/unity-builder#256, after we've resolved any discussions.

[webbertakken]

Great work. Thank you very much!

Note that this will start working only after 0.14 of the docker images has been released.