ci: verify that code generation works and results match

Signed-off-by: Antti Kervinen <[email protected]>

.github/workflows/ci.yml

@@ -51,7 +51,15 @@ jobs:
           echo "${{ github.workspace }}/bin" >> $GITHUB_PATH
 
       - run: |
+          sudo make install-protoc
+          make install-protoc-dependencies install-ttrpc-plugin
+          touch pkg/api/api.proto
           make all
+          test -z "$(git status --short | tee /dev/stderr)" || {
+              echo "Repository is in invalid state."
+              echo "Please make sure to commit all changes, including generated files."
+              exit 1
+          }
 
   linters:
     name: Linters