Make sure Codecov reports line coverage (#2698)

.github/scripts/gcov_wrapper

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This script is used in linux-ci.yml.
+# Bazel 7 started including branch coverage in the coverage report.
+# Now codecov is reporting branch coverage instead of line coverage.
+# This script makes sure branch coverage is not included so codecov reports line coveage.
+
+filtered_args=()
+
+for arg in "$@"; do
+  # Skip the argument if it's "-b"
+  if [ "$arg" != "-b" ]; then
+    filtered_args+=("$arg")
+  fi
+done
+
+gcov "${filtered_args[@]}"

.github/workflows/linux-ci.yml

@@ -216,6 +216,7 @@ jobs:
           xvfb-run -a \
             bazel coverage --combined_report=lcov  --instrumentation_filter="//:mbgl-core" \
             --test_output=errors --local_test_jobs=1 \
+            --repo_env=GCOV="$PWD/.github/scripts/gcov_wrapper" \
             --test_env=DISPLAY --test_env=XAUTHORITY --copt="-DCI_BUILD" \
             //test:core //render-test:render-test //expression-test:test
           echo coverage_report="$(bazel info output_path)"/_coverage/_coverage_report.dat >> "$GITHUB_ENV"