Add workflow to trigger community plugins release

Add .github/workflows/main-deploy.yaml which triggers on pushes to main and work/ss/main-branch-flow. The job dispatches a repository_dispatch to squaredup/plugins-automation to kick off community plugin releases, sending the current commit SHA as client_payload and using the AUTOMATION_DISPATCH_TOKEN secret with the gh CLI.

Author: shaswot77

.github/workflows/main-deploy.yaml

@@ -0,0 +1,20 @@
+name: Community Plugins — Release
+
+on:
+  push:
+    branches:
+      - "main"
+      - "work/ss/main-branch"
+
+jobs:
+  trigger-deploy:
+    name: Trigger Deployment
+    runs-on: ubuntu-latest
+    steps:
+      - name: Dispatch to plugins-automation
+        env:
+          GH_TOKEN: ${{ secrets.AUTOMATION_DISPATCH_TOKEN }}
+          SHA: ${{ github.sha }}
+        run: |
+          printf '{"event_type":"community-plugins-deploy","client_payload":{"sha":"%s"}}' "$SHA" \
+          | gh api repos/squaredup/plugins-automation/dispatches --method POST --input -