use triple quotes in case tee isn't groking multiline

Author: dev-dull

.github/workflows/docker-build.yaml

@@ -102,7 +102,7 @@ jobs:
 
       - name: Set Summary Headers
         run: |
-          echo -e "RESULTS=${{ env.COLS }}\n$(echo '${{ env.COLS }}' | sed -r 's/[^|]/-/g')" | tee -a $GITHUB_ENV
+          echo -e """RESULTS=${{ env.COLS }}\n$(echo '${{ env.COLS }}' | sed -r 's/[^|]/-/g')""" | tee -a $GITHUB_ENV
 
       - name: Run 'happy-path' Test
         run: |