[Firebase AI] Run quickstart build test using branch

.github/workflows/firebaseai.yml

@@ -175,11 +175,9 @@ jobs:
       run: scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebaseAI.podspec --platforms=${{ matrix.target }} ${{ matrix.warnings }}
 
   quickstart:
-    # Verifies the quickstart builds with this PR. Only run on pulls where branch is available.
-    if: github.event_name == 'pull_request'
     runs-on: macos-15
     env:
-      BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
+      BRANCH_NAME: ${{ github.head_ref || github.ref_name || 'main' }}
     steps:
     - uses: actions/checkout@v4
     - name: Build Quickstart

scripts/quickstart_spm_xcodeproj.sh

@@ -16,21 +16,45 @@
 
 
 # Modify a .xcodeproj to use a specific branch.
-# TODO: Update to transform from a release, as well as from `main`.
 
 set -xeuo pipefail
 
 SAMPLE=$1
-XCODEPROJ=${SAMPLE}/${SAMPLE}Example.xcodeproj/project.pbxproj
+SAMPLE_DIR=$(echo "$SAMPLE" | perl -ne 'print lc')
+XCODEPROJ=${SAMPLE_DIR}/${SAMPLE}Example.xcodeproj/project.pbxproj
 
-if grep -q "branch = main;" "$XCODEPROJ"; then
-  sed -i "" "s#branch = main;#branch = $BRANCH_NAME;#" "$XCODEPROJ"
+# Regex matches SemVer `firebase-ios-sdk` dependency in project.pbxproj:
+# {
+#   isa = XCRemoteSwiftPackageReference;
+#	  repositoryURL = "https://github.com/firebase/firebase-ios-sdk.git";
+#   requirement = {
+#     kind = upToNextMajorVersion;
+#	    minimumVersion = xx.yy.zz;
+#	  };
+# };
+REQUIREMENT_REGEX='({'\
+'\s*isa = XCRemoteSwiftPackageReference;'\
+'\s*repositoryURL = "https://github\.com/firebase/firebase-ios-sdk\.git";'\
+'\s*requirement = {\s*)kind = upToNextMajorVersion;'\
+'\s*minimumVersion = \d+\.\d+\.\d+;'\
+'(\s*};'\
+'\s*};)'
 
-  # Point SPM CI to the tip of `main` of
-  # https://github.com/google/GoogleAppMeasurement so that the release process
-  # can defer publishing the `GoogleAppMeasurement` tag until after testing.
-  export FIREBASECI_USE_LATEST_GOOGLEAPPMEASUREMENT=1
-else
-  echo "Failed to update quickstart's Xcode project to the current branch"
+# Replaces the minimumVersion requirement with a branch requirement.
+REPLACEMENT_REGEX="\1branch = $BRANCH_NAME;\n\t\t\t\tkind = branch;\2"
+
+# Performs the replacement using Perl.
+#
+# -0777 Enables reading all input in one go (slurp), rather than line-by-line.
+# -p Causes Perl to loop through the input line by line.
+# -i Edits the file in place.
+# -e Provides the expression to execute.
+perl -0777 -i -pe "s#$REQUIREMENT_REGEX#$REPLACEMENT_REGEX#g" "$XCODEPROJ" || {
+  echo "Failed to update quickstart's Xcode project to the branch: $BRANCH_NAME"
   exit 1
-fi
+}
+
+# Point SPM CI to the tip of `main` of
+# https://github.com/google/GoogleAppMeasurement so that the release process
+# can defer publishing the `GoogleAppMeasurement` tag until after testing.
+export FIREBASECI_USE_LATEST_GOOGLEAPPMEASUREMENT=1