Pre-build protoc from source

.github/workflows/kuksa_databroker-cli_build.yml

@@ -34,8 +34,6 @@ jobs:
     steps:
       - name: Installing JVM
         run: sudo apt update && sudo apt-get install -y default-jre
-      - name: Install Protoc
-        run: sudo apt-get install -y protobuf-compiler
       - uses: actions/checkout@v3
       - name: cargo fmt
         working-directory: ${{github.workspace}}

.github/workflows/kuksa_databroker_build.yml

@@ -34,8 +34,6 @@ jobs:
     steps:
       - name: Installing JVM
         run: sudo apt update && sudo apt-get install -y default-jre
-      - name: Install Protoc
-        run: sudo apt-get install -y protobuf-compiler
       - uses: actions/checkout@v3
       - name: cargo fmt
         working-directory: ${{github.workspace}}
@@ -60,8 +58,6 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Install Protoc
-        run: sudo apt-get install -y protobuf-compiler
       - uses: actions/checkout@v3
       - uses: actions-rs/install@v0.1
         with:

kuksa_databroker/databroker-proto/Cargo.toml

@@ -25,3 +25,4 @@ prost-types = { workspace = true }
 
 [build-dependencies]
 tonic-build = { workspace = true, features = ["transport", "prost"] }
+protobuf-src = "1.1.0"

kuksa_databroker/databroker-proto/build.rs

@@ -12,6 +12,7 @@
 ********************************************************************************/
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
+    std::env::set_var("PROTOC", protobuf_src::protoc());
     tonic_build::configure()
         .compile_well_known_types(false)
         .protoc_arg("--experimental_allow_proto3_optional")