Add slack notification upon release published (#260)

* Workflow: Add slack notification upon release published

* Workflow: Corrected owner env

* Workflow: Updated PAT name

* Workflow: Removed slack notification and moved to documentation repo

Author: lamATnginx

.github/workflows/build-push.yml

@@ -1,9 +1,6 @@
 name: build preview
 
 on: 
-  release: 
-    types: 
-      - published
   pull_request:
     branches:
       - "*"

.github/workflows/release-build.yml

@@ -0,0 +1,24 @@
+name: Build preview on documentation repo upon release publish
+
+on: 
+  release: 
+    types: 
+      - published
+
+env:
+  OWNER: nginx
+  REPO: documentation
+
+jobs:
+  trigger-documentation-build:
+    runs-on: ubuntu-latest
+    steps: 
+     - name: Trigger 'Build and deploy' workflow in 'documentation' repo
+       run: |
+        curl -L \
+            -X POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: Bearer ${{ secrets.DOCUMENTATION_SLACK_FLOW_PAT }}" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            "https://api.github.com/repos/${{ env.OWNER }}/${{ env.REPO }}/dispatches" \
+            -d "{\"event_type\": \"trigger-preview-build\", \"client_payload\": {\"environment\": \"preview\", \"hugo_theme_override\": \"\", \"author\": \"${{ github.event.release.author.login }}\", \"tag_name\": \"${{ github.event.release.tag_name }}\", \"release_name\": \"${{ github.event.release.name }}\"}}"