Adds an iOS GitHub actions test.

PiperOrigin-RevId: 594287476

.github/workflows/build.yaml

@@ -42,3 +42,46 @@ jobs:
         env:
           COMMIT_RANGE: ${{ env.COMMIT_RANGE }}
           REGEX: ${{ matrix.regex }}
+
+  # Step 3: Build iOS sample
+  build:
+    name: Build
+    runs-on: macOS-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        regex:
+        # copybara:strip_begin
+        # LINT.IfChange
+        # copybara:strip_end
+        - "ios"
+        # copybara:strip_begin
+        # LINT.ThenChange(//depot/google3/googlemac/iPhone/InteractiveMediaAds/IMA/ios/samples/clientSide/copy.bara.sky)
+        # copybara:strip_end
+    steps:
+      - name: Clone Repository
+        uses: actions/checkout@v1
+
+      - name: Xcode version
+        run: /usr/bin/xcodebuild -version
+
+      - name: Pod repo update
+        run: pod repo update
+
+      - name: Install xcpretty
+        run: sudo gem install xcpretty
+
+      - name: Set commit range (push to the main branch, for example, merge)
+        if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+        run: echo "COMMIT_RANGE="${{ github.event.before }}.."" >> $GITHUB_ENV
+
+      - name: Set commit range (pull request)
+        if: github.event_name == 'pull_request'
+        run: echo "COMMIT_RANGE="HEAD~.."" >> $GITHUB_ENV
+
+      - name: Build
+        run: .github/workflows/build/ios_build.sh
+        shell: bash
+        env:
+          COMMIT_RANGE: ${{ env.COMMIT_RANGE }}
+          REGEX: ${{ matrix.regex }}

.github/workflows/build/build.sh

@@ -14,3 +14,33 @@ do
     popd;
   fi
 done
+
+#!/bin/bash
+# Script to build iOS sample app (Objective-C or Swift)
+# $REGEX variable, using build.sh script.
+
+set -eo pipefail
+
+# An array that holds the google3 path to each example app
+EXAMPLE_APPS_PATHS_ARRAY=()
+
+while read -r line; do
+  app_path=$(dirname "${line}");
+  EXAMPLE_APPS_PATHS_ARRAY+=("${app_path#./}");
+done < <(find . -name Podfile -type f -d | grep -E "${REGEX}")
+
+for example_app_path in "${EXAMPLE_APPS_PATHS_ARRAY[@]}"
+do
+  CHANGES="$(git --no-pager diff --name-only "${COMMIT_RANGE}")";
+  echo "Project dir: ${example_app_path}";
+  if [[ -n "$(grep -E "(${example_app_path}|\.github\/workflows)" <<< "${CHANGES}")" ]]; then
+    echo "Building for ${example_app_path}";
+    example_name=$(echo "${example_app_path}" | xargs -I{} basename {});
+    echo "::set-output name=building_app::Pod install for App (${example_name})";
+    pushd "${example_app_path}";
+    pod install --no-repo-update;
+    echo "::set-output name=building_app::Building App (${example_name})";
+    eval "xcodebuild -workspace ${example_name}.xcworkspace -scheme ${example_name} -sdk iphonesimulator -arch x86_64 | xcpretty";
+    popd;
+  fi
+done

.github/workflows/build/ios_build.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# Script to build iOS sample app (Objective-C or Swift)
+# $REGEX variable, using ios_build.sh script.
+
+set -eo pipefail
+
+# An array that holds the google3 path to each example app
+EXAMPLE_APPS_PATHS_ARRAY=()
+
+while read -r line; do
+  app_path=$(dirname "${line}");
+  EXAMPLE_APPS_PATHS_ARRAY+=("${app_path#./}");
+done < <(find . -name Podfile -type f -d | grep -E "${REGEX}")
+
+for example_app_path in "${EXAMPLE_APPS_PATHS_ARRAY[@]}"
+do
+  CHANGES="$(git --no-pager diff --name-only "${COMMIT_RANGE}")";
+  echo "Project dir: ${example_app_path}";
+  if [[ -n "$(grep -E "(${example_app_path}|\.github\/workflows)" <<< "${CHANGES}")" ]]; then
+    echo "Building for ${example_app_path}";
+    example_name=$(echo "${example_app_path}" | xargs -I{} basename {});
+    echo "::set-output name=building_app::Pod install for App (${example_name})";
+    pushd "${example_app_path}";
+    pod install --no-repo-update;
+    echo "::set-output name=building_app::Building App (${example_name})";
+    eval "xcodebuild -workspace ${example_name}.xcworkspace -scheme ${example_name} -sdk iphonesimulator -arch x86_64 | xcpretty";
+    popd;
+  fi
+done