Enhance CI with build notification workflows

Add notification steps for build success and failure.

Author: alexheifetz

.github/workflows/maven.yml

@@ -35,3 +35,17 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
         run: mvn -U -B test verify
+
+  notify:
+    needs: [build]
+    if: failure() && github.ref == 'refs/heads/main'
+    uses: embabel/embabel-build/.github/workflows/discord-notify.yml@main
+    secrets: inherit
+
+  notify-recovery:
+    needs: [build]
+    if: success() && github.ref == 'refs/heads/main'
+    uses: embabel/embabel-build/.github/workflows/notify-recovery.yml@main
+    with:
+      branch: main
+    secrets: inherit