Support environment variables and bash expressions in file names

It would be great to be able to use environment variables and the output of bash expressions like below:

- name: Prepare GitHub Release
  run: mv some.file some.file-$GITHUB_SHA-$(git describe --tags --exact-match)
- name: Release to GitHub Releases
  uses: docker://softprops/action-gh-release
  if: startsWith(github.ref, 'refs/tags/')
  with:
    files: some.file-$GITHUB_SHA-$(git describe --tags --exact-match)
  env:
    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

[tenzap]

It would be easier if access to environment vars, as well as to $HOME or ~ was available.

It took me some time to figure out this workaround: put the environment var you need into the env context, and the use that.

To put the environment var you need into the env context, add this a step of your job:

echo "my_home=$HOME" >> $GITHUB_ENV

Then in softprops/action-gh-release@v1 step you can use it like this:

  with:
    files: ${{ env.my_home }}/aFile

Maybe this can help someone.

[tuler]

If you don’t have the exact string you want in a GitHub context variable, you can use a step to create an output with the value you need. Example:

- run: echo ::set-output name=version::${GITHUB_REF/refs\/tags\//''}
  id: release
- uses: softprops/action-gh-release@v1
  with:
    files: some.file-${{ steps.release.outputs.version }}.tar.gz
    env:
      GITHUB_TOKEN: ${{ secrets.CI_TOKEN }}