feat(workflow): add Slack notifications for build start, success, and failure [skip-build] (#12)

.github/workflows/build-and-commit.yml

@@ -39,6 +39,19 @@ jobs:
       - name: Show disk usage
         run: df -h
 
+      - name: Notify build start on Slack
+        id: slack_start
+        run: |
+          msg="*Build started* for \`${{ github.repository }}\`\nBranch: \`${{ github.ref_name }}\`\n<${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}|View Workflow>"
+          response=$(curl -s -X POST \
+            -H "Authorization: Bearer ${{ secrets.SLACK_TOKEN }}" \
+            -H "Content-type: application/json; charset=utf-8" \
+            --data "{\"channel\":\"${{ secrets.SLACK_CHANNEL_ID }}\",\"text\":\"$msg\"}" \
+            https://slack.com/api/chat.postMessage)
+          ts=$(echo "$response" | jq -r '.ts')
+          echo "thread_ts=$ts" >> "$GITHUB_OUTPUT"
+          echo "$response"
+
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
@@ -83,3 +96,25 @@ jobs:
         env:
           HEAD_REF: ${{ github.head_ref || github.ref }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Notify success on Slack (thread)
+        if: success()
+        run: |
+          ts="${{ steps.slack_start.outputs.thread_ts }}"
+          msg="*Build succeeded* for \`${{ github.repository }}\`\nBranch: \`${{ github.ref_name }}\`\n<${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}|View Workflow>"
+          curl -s -X POST \
+            -H "Authorization: Bearer ${{ secrets.SLACK_TOKEN }}" \
+            -H "Content-type: application/json; charset=utf-8" \
+            --data "{\"channel\":\"${{ secrets.SLACK_CHANNEL_ID }}\",\"text\":\"$msg\",\"thread_ts\":\"$ts\"}" \
+            https://slack.com/api/chat.postMessage
+
+      - name: Notify failure on Slack (thread)
+        if: failure()
+        run: |
+          ts="${{ steps.slack_start.outputs.thread_ts }}"
+          msg="*Build failed* for \`${{ github.repository }}\`\nBranch: \`${{ github.ref_name }}\`\n<${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}|View Workflow>"
+          curl -s -X POST \
+            -H "Authorization: Bearer ${{ secrets.SLACK_TOKEN }}" \
+            -H "Content-type: application/json; charset=utf-8" \
+            --data "{\"channel\":\"${{ secrets.SLACK_CHANNEL_ID }}\",\"text\":\"$msg\",\"thread_ts\":\"$ts\"}" \
+            https://slack.com/api/chat.postMessage