add the header/data divider

Author: dev-dull

.github/workflows/docker-build.yaml

@@ -100,6 +100,7 @@ jobs:
           echo '## Terraform ${{ matrix.terraform_version }}' >> $GITHUB_STEP_SUMMARY
           COLS="|Test Name|Status|"
           echo "${COLS}" >> /tmp/summary
+          echo "${COLS}" | sed -r 's/[^|]/-/g' >> /tmp/summary
 
       - name: Run 'happy-path' Test
         run: |