Perf & switch to Ubuntu-20.04 with g++-11

.github/workflows/rust_build.yml

@@ -1,4 +1,4 @@
-name: Build
+name: Test
 
 on:
   push:
@@ -11,19 +11,19 @@ env:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
       - uses: actions/checkout@v3
         with:
           submodules: recursive
       - name: Install dependencies
-        run: sudo apt-get install -y libseccomp-dev protobuf-compiler
+        run: sudo apt-get install -y libseccomp-dev protobuf-compiler g++-11
+      - name: Setup g++-11
+        run: sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-11 100
       - name: Check ENV
-        run: echo $(rustup --version && gcc -v && g++ -v)
+        run: echo $(rustup --version && g++ -v)
       - name: Build test dist
         run: cd test-collection && ./build.sh && cd ..
-      - name: Build target
-        run: cargo build --verbose
       - name: Run tests
         run: cargo test --verbose -- --nocapture