Refactor rebuild parts of CI for more reuse

.github/workflows/main.yml

@@ -76,3 +76,13 @@ jobs:
         token: ${{ secrets.CODECOV_TOKEN }}
         file: ./target/site/jacoco/jacoco.xml
         flags: unittests
+
+  trigger-dep-build:
+    name: Trigger downstream builds
+    needs: [build]
+    # 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
+    with:
+      secrets:
+        token: ${{ secrets.REPO_DISPATCH }}

.github/workflows/trigger_dep_builds.yml

@@ -0,0 +1,29 @@
+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-dataformats-binary'
+          - 'FasterXML/jackson-dataformats-text'
+          - 'FasterXML/jackson-dataformat-xml'
+
+    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" }'

dep_build.yml

@@ -0,0 +1,39 @@
+name: Re-build on jackson-core push
+on:
+  repository_dispatch:
+    types: [jackson-core-pushed]
+  # just for testing
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    # Do we want wide matrix build? For now, limited
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        java_version: ['8', '17', '21']
+        os: ['ubuntu-22.04']
+    env:
+      JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
+    steps:
+    - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+    - name: Set up JDK
+      uses: actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9 # v4.2.1
+      with:
+        distribution: 'temurin'
+        java-version: ${{ matrix.java_version }}
+        cache: 'maven'
+    - name: Build and test
+      run: ./mvnw -B -ff -ntp clean verify
+
+  # And let's proceed recursively...
+  trigger-downstream-builds:
+    name: Trigger downstream builds
+    uses: ./.github/workflows/trigger_dep_builds.yml
+    with:
+      secrets:
+        token: ${{ secrets.REPO_DISPATCH }}