use git rev-parse

Author: lobsterkatie

.github/workflows/build.yml

@@ -48,7 +48,7 @@ jobs:
         with:
           ref: ${{ env.HEAD_COMMIT }}
       - name: Get commit message
-        run: echo "COMMIT_MESSAGE=$(git log -n 1 --pretty=format:%s $GITHUB_HEAD_REF)" >> $GITHUB_ENV
+        run: echo "COMMIT_MESSAGE=$(git log -n 1 --pretty=format:%s $(git rev-parse $GITHUB_HEAD_REF))" >> $GITHUB_ENV
       - name: "BRANCH: ${{ github.ref_name }}"
         run: echo ""
       - name: "COMMIT: ${{ env.COMMIT_MESSAGE }}"