Add a previous_version output, equivalent to the PREVIOUS_REVISION environment variable, or similar

[Clockwork-Muse]

I'm trying to condition following steps in my workflow to only run if a bump occurred. To that end, it would be nice if there was an output available, so I could do something like the following:

- name: Run check
     if: ${{ steps.bump.outputs.version }} != ${{steps.bump.outputs.previous_version }}
        run: |
          echo "whatever"

... and/or some boolean output I could refer to afterwards (but knowing the previous version is useful generally).

I'm aware of the PREVIOUS_VERSION environment variable, however it's not available for if checks there, and autocomplete in VSCode of course complains it doesn't exist.

[Clockwork-Muse]

Okay, it turns out that the environment variable is available there, the following works:

- name: Run check
     if: steps.bump.outputs.version != env.PREVIOUS_REVISION
        run: |
          echo "whatever"

(I'm still figuring out some aspects of GitHub actions and their expressions)

.... VSCode does complain pretty loudly about the reference potentially not being available, though...

[woile]

I'm not sure why github reports this. I'm glad it works, feel free to open again