Refactor downstream re-build CI

.github/workflows/main.yml

@@ -81,21 +81,8 @@ jobs:
   trigger-dep-build:
     name: Trigger downstream builds
     needs: [build]
-    if: ${{ github.event_name == 'push' }}
-    runs-on: ubuntu-latest
-
-    strategy:
-      fail-fast: false
-      matrix:
-        repo: [ 'FasterXML/jackson-databind' ]
-
-    steps:
-      - name: Repository dispatch
-        uses: peter-evans/repository-dispatch@v3
-        with:
-          # Does regular token work within same org?
-          token: ${{ secrets.REPO_DISPATCH }}
-          repository: ${{ matrix.repo }}
-          event-type: jackson-core-pushed
-          # Could push information on what was built but not yet
-          client-payload: '{"version": "N/A" }'
+    # Only for pushes to default branch
+    if: ${{ github.event_name == 'push' && github.event.ref_name == github.event.repository.default_branch }}
+    uses: ./.github/workflows/trigger_dep_builds.yml
+    secrets:
+      token: ${{ secrets.REPO_DISPATCH }}

.github/workflows/trigger_dep_builds.yml

@@ -0,0 +1,29 @@
+# Reusable workflow; extracted for maintainability
+
+name: Trigger downstream builds
+on:
+  workflow_call:
+    secrets:
+      token:
+        required: true
+
+jobs:
+  trigger-dep-build:
+    name: Trigger downstream builds
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        repo:
+          - 'FasterXML/jackson-databind'
+
+    steps:
+      - name: Repository dispatch
+        uses: peter-evans/repository-dispatch@v3
+        with:
+          token: ${{ secrets.token }}
+          repository: ${{ matrix.repo }}
+          event-type: jackson-databind-pushed
+          # Could push information on what was built but not yet
+          client-payload: '{"version": "N/A" }'