Check if NIMS and NIMG versions are different before committing (#585)

* Don't commit version changes if empty

* Add conditional for pushing commit to branch

* Use GITHUB_OUTPUT for check

* Move brackets outside whole expression

* Add a fi statement. Use a boolean variable

.github/workflows/Publish_NIMS.yml

@@ -54,15 +54,20 @@ jobs:
         working-directory: ./ni_measurementlink_generator
 
       - name: Commit file changes
+        id: commit
         if: ${{ startsWith(github.event.release.target_commitish, 'main') || startsWith(github.event.release.target_commitish, 'releases/') }}
         run: |
-          git config --local user.email "[email protected]"
-          git config --local user.name "GitHub Action"
-          git add .
-          git commit -m "Promote NIMS package version and update Sphinx generated files in _docs" -a
+          echo "version_changed=false" >> $GITHUB_OUTPUT
+          if [ -n "$(git status --porcelain)" ]; then
+            git config --local user.email "[email protected]"
+            git config --local user.name "GitHub Action"
+            git add .
+            git commit -m "Promote NIMS and NIMG package version" -a
+            echo "version_changed=true" >> $GITHUB_OUTPUT
+          fi
       
       - name: Push changes to the appropriate branch
-        if: ${{ startsWith(github.event.release.target_commitish, 'main') || startsWith(github.event.release.target_commitish, 'releases/') }}
+        if: ${{ steps.commit.outputs.version_changed && (startsWith(github.event.release.target_commitish, 'main') || startsWith(github.event.release.target_commitish, 'releases/')) }}
         uses: CasperWA/push-protected@v2
         with:
           token: ${{ secrets.ADMIN_PAT }}