format slack message

Author: jencarlucci

.github/workflows/linter-failure-notifier.yml

@@ -43,7 +43,15 @@ jobs:
             target_line="• Trigger: ${TRIGGER_EVENT}"
           fi
 
-          message=":warning: Linter workflow failed in ${REPO}.\n• Workflow: ${RUN_NAME}\n${target_line}\n• Branch: ${BRANCH}\n• Commit: ${short_sha}\n• Run: ${RUN_URL}"
+          message=$(cat <<EOF
+:warning: Linter workflow failed in ${REPO}.
+• Workflow: ${RUN_NAME}
+${target_line}
+• Branch: ${BRANCH}
+• Commit: ${short_sha}
+• Run: ${RUN_URL}
+EOF
+)
 
           curl --fail --silent --show-error \
             -X POST \