feat: refactor github build steps

PiperOrigin-RevId: 845335954

Author: koumiGoogle

.github/actions/prepare-deps/action.yml

@@ -59,29 +59,3 @@ runs:
         git clone --depth 1 https://chromium.googlesource.com/chromium/tools/depot_tools.git
         echo "$(pwd)/depot_tools" >> $GITHUB_PATH
       shell: bash
-
-    - name: 📡 Fetch and build WebRTC
-      if: ${{ steps.cache-webrtc.outputs.cache-hit != 'true' }}
-      run: |
-        mkdir webrtc-checkout
-        pushd webrtc-checkout
-        fetch --nohooks webrtc
-        pushd src
-        git checkout b00c469cad3f8c926fcf81ded90b90b6e1e62b9c
-        popd
-        sed -i -e "s|'src/resources'],|'src/resources'],'condition':'rtc_include_tests==true',|" src/DEPS
-        gclient sync
-        pushd src
-        gn gen out/Default --args='is_debug=false use_custom_libcxx=false rtc_include_tests=false rtc_build_examples=false dcheck_always_on=true rtc_use_x11=false use_rtti=true'
-        ninja -C out/Default
-        popd
-        mv src webrtc
-        pushd webrtc
-        # Delete all unnecessary files, maintaining directory structure. Required to conserve Github
-        # runner disk space.
-        find . -type f ! -name "libwebrtc.a" ! -name "*.h" ! -path "*/boringssl/src/*" -delete
-        # Housekeeping: delete empty directories.
-        find . -type d -empty -delete
-        popd
-        popd
-      shell: bash

.github/workflows/main.yml

@@ -33,13 +33,9 @@ jobs:
       - name: 📦 Prepare dependencies
         uses: ./.github/actions/prepare-deps
 
-      - name: 🚧 Build
+      - name: 🕸️ Build Web
         run: |
-          sed -i -e 's|webrtc_path = ".*"|webrtc_path = "${{ github.workspace }}/webrtc-checkout/"|g' WORKSPACE
-          # Don't `build ...`, as includes irrelevant targets in `webrtc-checkout`.
-          bazel-7.4.1 build cpp/...
           bazel-7.4.1 build web/...
 
-      - name: 🔍 Test
-        run: |
-          bazel-7.4.1 test cpp/...
+      - name: 🚧 Build C++
+        uses: ./cpp/build.sh