Multiple platform build using travis

[gb0101010101]

Came across a repo that apparently has travis example to cross compile to "arm32 (armv8l)" for RaspberryPi, Win32/64, and Mac.
https://github.com/junaruga/ci-multi-arch-native-test/blob/master/.travis.yml

Might be of use to our build scripts.

[gb0101010101]

Also some code for getting SOURCE_BRANCH, SOURCE_TAG, or tag defaulting to branch (SOURCE_NAME) when building.
https://github.community/t/how-to-get-just-the-tag-name/16241/11

    name: Branch name
        id: branch_name
        run: |
          echo ::set-output name=SOURCE_NAME::${GITHUB_REF#refs/*/}
          echo ::set-output name=SOURCE_BRANCH::${GITHUB_REF#refs/heads/}
          echo ::set-output name=SOURCE_TAG::${GITHUB_REF#refs/tags/}

    name: Build base image
        run: |
          echo $SOURCE_NAME
          echo $SOURCE_BRANCH
          echo $SOURCE_TAG
        env:
          SOURCE_NAME: ${{ steps.branch_name.outputs.SOURCE_NAME }}
          SOURCE_BRANCH: ${{ steps.branch_name.outputs.SOURCE_BRANCH }}
          SOURCE_TAG: ${{ steps.branch_name.outputs.SOURCE_TAG }}

This could be used to auto generate the release name in format:

• Stable: v0.94
• PreRelease: v0.94_20201128T134055 (yyyyMMddTHHmmss)

I think we should have all release continue to begin with with the existing vN.NNNN format to make sure that the release manager will continue to function for people using old version. e.g. the test pre-release breaks release manager right now.