Run CI Summary on Bash Shell

Signed-off-by: Christian Brabandt <[email protected]>

Author: chrisbra

.github/workflows/windows-arm-build.yml

@@ -129,6 +129,7 @@ jobs:
           done
 
       - name: Post Summary
+        shell: bash
         run: |
           echo "## ✅ Windows ARM Build Summary" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY