Add dockerized build.

.github/workflows/rtp.io.yml

@@ -76,3 +76,35 @@ jobs:
 
       - name: Build rtp.io module
         run: make -C modules/rtp.io
+
+  build_in_docker:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+    container:
+      image: sippylabs/rtpproxy:latest
+    continue-on-error: true
+    env:
+      COMPILER: ${{ matrix.compiler }}
+      BUILD_OS: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: ['gcc', 'clang', 'gcc-11', 'gcc-12', 'clang-11', 'clang-12', 'clang-13', 'clang-14', 'clang-15']
+
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Install dependencies
+        run: |
+          sh -x scripts/build/reset_sources.sh
+          sh -x scripts/build/install_depends.sh
+
+      - name: Build
+        run: sh -x scripts/build/do_build.sh
+
+      - name: Build rtp.io module
+        run: make -C modules/rtp.io