🌱 Fix the protobuf GitHub runner issue (#801)

Fixes the protobuf GitHub runner issue by cloning the repository and
installing it locally.

Source  https://lukasjoswiak.com/github-actions-protobuf/

.github/workflows/main.yml

@@ -18,24 +18,42 @@ jobs:
   validate:
     name: Validate 
     runs-on: ubuntu-latest
-    # Pull requests from the same repository won't trigger this checks as they were already triggered by the push
-    if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
     steps:
-      - name: Clone the code
-        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # v2.3.4
-        with:
+     - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
+     - name: Cache protobuf library.
+       id: cache-protobuf
+       uses: actions/cache@d9747005de0f7240e5d35a68dca96b3f41b8b340
+       with:
+         path: protobuf
+         key: ${{ runner.os }}-protobuf
+     - name: Build protobuf library.
+       if: steps.cache-protobuf.outputs.cache-hit != 'true'
+       run: |
+         git clone https://github.com/protocolbuffers/protobuf.git
+         cd protobuf
+         git submodule update --init --recursive
+         ./autogen.sh
+         ./autogen.sh  # see https://github.com/protocolbuffers/protobuf/issues/149
+         ./configure
+         make
+         make check
+     - name: Install protobuf library
+       run: |
+         cd protobuf
+         sudo make install
+         sudo ldconfig
+     - name: Clone the code
+       uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # v2.3.4
+       with:
           fetch-depth: 0
-      - name: Setup Go
-        uses: actions/setup-go@37335c7bb261b353407cff977110895fa0b4f7d8 # v2.1.3
-        with:
-          go-version: '^1.16'
-      - name: Run presubmit tests
-        run: |
-              go env -w GOFLAGS=-mod=mod
-              make all
-      - uses: codecov/codecov-action@29386c70ef20e286228c72b668a06fd0e8399192 # v1.5.0
-        with:
-          files: e2e/e2e.coverprofile,pkg/pkg.coverprofile,checks/checks.coverprofile
+     - name: Setup Go
+       uses: actions/setup-go@37335c7bb261b353407cff977110895fa0b4f7d8 # v2.1.3
+       with:
+         go-version: '^1.16'
+     - name: Run presubmit tests
+       run: |
+            go env -w GOFLAGS=-mod=mod
+            make all
   license-check:
     name: license boilerplate check
     runs-on: ubuntu-latest