Make lite version of CI (#5188)

# Description of Changes
Add lite mode for CI which just runs the most important jobs for
deployment. This won't be used in this repo, but allows other repos
containing Stirling to easily disable jobs like desktop builds etc. if
they're unnecessary, without needing to deal with conflicts in the
files. They'll just need to set the repo variable `CI_PROFILE` to
`lite`. We have an upstream repo that we'd like these changes for.

.github/workflows/multiOSReleases.yml

@@ -31,6 +31,7 @@ permissions:
 
 jobs:
   determine-matrix:
+    if: ${{ vars.CI_PROFILE != 'lite' }}
     runs-on: ubuntu-latest
     outputs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}