Notify Slack on new release.

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
           path: dist/
 
   pypi-publish:
-    name: Upload release to Test PyPI
+    name: Upload release to PyPI
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
     needs:
       - build
@@ -72,3 +72,29 @@ jobs:
           gh release create '${{ github.ref_name }}' ./dist/*.tar.gz ./dist/*.whl
           --generate-notes
           --repo '${{ github.repository }}'
+
+  release-notify:
+    runs-on: ubuntu-latest
+    needs:
+      - github-publish
+    if: ${{ always() }}
+    steps:
+      - name: Inform the Codemonkeys
+        uses: 8398a7/action-slack@v3
+        continue-on-error: true
+        with:
+          status: custom
+          fields: workflow,job,commit,repo,ref,author,took
+          custom_payload: |
+            {
+              username: 'action-slack',
+              icon_emoji: ':octocat:',
+              attachments: [{
+                color: '${{ needs.github-publish.result }}' === 'success' ? 'good' : '${{ needs.github-publish.result }}' === 'failure' ? 'danger' : 'warning',
+                text: `${process.env.AS_REPO}@${process.env.AS_REF}\n ${process.env.AS_WORKFLOW} (${process.env.AS_COMMIT})\n by ${process.env.AS_AUTHOR}\n Status: ${{ needs.github-publish.result }}`,
+              }]
+            }
+        env:
+          GITHUB_TOKEN: ${{ github.token }} # required
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }} # required
+          MATRIX_CONTEXT: ${{ toJson(matrix) }} # required