Add protocol buffer generation automation to maintain sync with upstream Kubernetes

.github/workflows/generate.yml

@@ -73,12 +73,22 @@ jobs:
 
           USE_SINGLE_PARAMETER=true bash java.sh ../../kubernetes/ settings
           popd
-          rm -rf gen
           git config user.email "k8s-publishing-bot@users.noreply.github.com"
           git config user.name "Kubernetes Publisher"
           git checkout -b "$BRANCH"
           git add .
           git commit -s -m 'Automated openapi generation from ${{ github.event.inputs.kubernetesBranch }}'
+      - name: Generate Proto
+        run: |
+          pushd gen/proto
+          # Download proto dependencies for the specified Kubernetes branch
+          bash dependencies.sh "${{ github.event.inputs.kubernetesBranch }}"
+          # Generate Java proto classes
+          bash generate.sh java ../../proto/src/main/java/
+          popd
+          rm -rf gen
+          git add proto/
+          git commit -s -m 'Automated proto generation from ${{ github.event.inputs.kubernetesBranch }}'
       - name: Apply Manual Diffs
         if: ${{ github.event.inputs.skip_patches != 'true' }}
         run: |

proto/README.md

@@ -1,7 +1,43 @@
 # Generating proto files
 
+## Automated Generation
+
+Protocol buffer files are automatically generated as part of the regular code generation workflow when a new Kubernetes release is published. This happens through the GitHub Actions workflow defined in `.github/workflows/generate.yml`.
+
+To trigger proto generation manually along with OpenAPI generation:
+
+1. Go to the [Generate workflow](https://github.com/kubernetes-client/java/actions/workflows/generate.yml) in GitHub Actions
+2. Click "Run workflow"
+3. Specify the Kubernetes branch (e.g., "release-1.30" or "master")
+4. The workflow will automatically:
+   - Generate OpenAPI client code
+   - Generate protocol buffer classes
+   - Apply any necessary patches
+   - Generate fluent API
+   - Create a pull request with all changes
+
+## Manual Generation
+
+For local development or testing, you can generate proto files manually using the provided script:
+
+```sh
+cd /path/to/kubernetes-client-java
+KUBERNETES_BRANCH=master bash scripts/update-proto.sh
+```
+
+You can specify a different Kubernetes branch/tag:
+
+```sh
+KUBERNETES_BRANCH=release-1.30 bash scripts/update-proto.sh
+```
+
+## Using the kubernetes-client/gen Repository Directly
+
+Alternatively, you can use the kubernetes-client/gen repository directly:
+
 ```sh
 git clone https://github.com/kubernetes-client/gen
 cd gen/proto
-./generate.sh java ${PATH_TO_JAVA_CLIENT_ROOT}/java/proto/src/main/java/
+bash dependencies.sh master  # or specify a different branch
+bash generate.sh java ${PATH_TO_JAVA_CLIENT_ROOT}/proto/src/main/java/
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