ci: initiate enterprise build (#3424)

For each incoming PR, build the enterprise container too.

.github/workflows/dispatch-event-enterprise.yml

@@ -0,0 +1,32 @@
+name: initiate_enterprise_build
+
+on:
+  pull_request:
+    branches:
+      - "*"
+
+jobs:
+  initiate_enterprise_build:
+    if: ${{ github.event.pull_request.head.repo.fork == false }} # Only run for PRs which are not from forks
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+    - name: Generate token
+      id: generate_token
+      uses: actions/create-github-app-token@v1
+      with:
+          private-key: ${{ secrets.PRIVATE_KEY }}
+          app-id: ${{ secrets.APP_ID }}
+          # Set the owner, so the token can be used in all repositories
+          owner: ${{ github.repository_owner }}
+    - name: Repository Dispatch
+      uses: peter-evans/repository-dispatch@v3
+      env:
+        TOKEN: ${{ steps.generate_token.outputs.token }}
+        BRANCH_NAME: ${{ github.head_ref || github.ref_name }} 
+      with:
+          token: ${{ env.TOKEN }} # GitHub App installation access token
+          repository: openobserve/o2-enterprise
+          event-type: initiate-enterprise-build
+          client-payload: '{"o2_enterprise_repo": "main", "o2_opensource_repo": "${{ env.BRANCH_NAME }}"}'