chore: add an unmanaged dependency check (#2038)

* chore: add a check

* add a working directory

* add action.yaml directory

* change mvn command

* add shell

* change target

* change target

* change target

* change tag

* add an unmanaged dependency to verify the check

* remove test scope

* remove dependency

.github/workflows/unmanaged_dependency_check.yaml

@@ -0,0 +1,26 @@
+on:
+  pull_request:
+name: Unmanaged dependency check
+jobs:
+  unmanaged_dependency_check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-java@v3
+      with:
+        distribution: temurin
+        java-version: 11
+    - name: Install modules
+      shell: bash
+      run: |
+        mvn -B -V -ntp -DskipTests=true \
+        -Dclirr.skip=true \
+        -Denforcer.skip=true \
+        -Dmaven.javadoc.skip=true \
+        -Dgcloud.download.skip=true \
+        -T 1C \
+        clean install
+    - name: Unmanaged dependency check
+      uses: googleapis/sdk-platform-java/java-shared-dependencies/unmanaged-dependency-check@unmanaged-dependencies-check-latest
+      with:
+        bom-path: google-cloud-bigtable-bom/pom.xml