Add workflow notify dist-arch update

.github/workflows/dist-update-notification.yml

@@ -0,0 +1,38 @@
+name: Notify Discussion on dist-arch Change
+
+on:
+  push:
+    paths:
+      - 'dist-arch/**'
+
+jobs:
+  notify-discussion:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Add comment to discussion as notification
+        id: notify
+        env:
+          DISCUSSION_NUMBER: 2140
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          MESSAGE="🔔 Directory \`dist-arch/\` has changed.\n"
+          MESSAGE+="🔗 Commit message: ${{ github.event.head_commit.message }}\n"
+          MESSAGE+="🔗 Commit hash: ${{ github.sha }}"
+
+          RESPONSE=$(curl -s -X POST \
+            -H "Authorization: Bearer $GITHUB_TOKEN" \
+            -H "Accept: application/vnd.github+json" \
+            https://api.github.com/repos/${{ github.repository }}/discussions/${DISCUSSION_NUMBER}/comments \
+            -d "{\"body\": \"$MESSAGE\"}")
+
+          if echo "$RESPONSE" | grep -q '"id":'; then
+            echo "Succeed in creating comment under discussion ${DISCUSSION_NUMBER}."
+            echo "response=$RESPONSE" >> $GITHUB_OUTPUT
+          else
+            echo "Failed in creating comment under discussion ${DISCUSSION_NUMBER}."
+            echo "$RESPONSE" >&2
+            exit 1
+          fi