bug(ci): ci-test-systemd workflow fails with protoc: No such file or directory

## Bug Report **General Information** - Environment: GitHub Actions runner (ubuntu-22.04) - Affected workflow: `.github/workflows/ci-test-systemd.yml` - Affected step: `Install protoc` and `Build Systemd Release` **To Reproduce** 1. Push a change to any path matching the workflow trigger (`KubeArmor/**`, `tests/**`, `protobuf/**`) 2. The `ci-test-systemd` workflow starts and reaches the `Build Systemd Release` step 3. `make local-release` invokes `make -C ../protobuf` which calls `protoc` directly 4. The step fails immediately **Expected behavior** The `protoc` compiler binary should be available on the runner so `make local-release` can compile the protobuf definitions and proceed with the systemd release build. **Root Cause** The `Install protoc` step installs only the Go protoc plugins via `go install`: ```yaml - name: Install protoc run: | go install google.golang.org/protobuf/cmd/protoc-gen-go@latest go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest ``` This does not install the `protoc` compiler binary itself. The `protobuf/Makefile` calls `protoc` directly, which is not on PATH, causing the build to fail with exit code 127. **Screenshots** <img width="1547" height="186" alt="Image" src="https://github.com/user-attachments/assets/4f12adf0-3099-47fe-bece-562a1e30690a" /> **Proposed Fix** Update the `Install protoc` step in `.github/workflows/ci-test-systemd.yml` to also install the `protoc` binary and add the Go bin directory to PATH: ```yaml - name: Install protoc run: | sudo apt-get update sudo apt-get install -y protobuf-compiler go install google.golang.org/protobuf/cmd/protoc-gen-go@latest go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest echo "$(go env GOPATH)/bin" >> "$GITHUB_PATH" ```