Add C++ coverage configuration and workflow

Author: 4og

.bazelrc

@@ -63,3 +63,8 @@ build:bl-aarch64-qnx --incompatible_strict_action_env
 build:bl-aarch64-qnx --platforms=@score_bazel_platforms//:aarch64-qnx-sdp_8.0.0-posix
 build:bl-aarch64-qnx --extra_toolchains=@score_qcc_aarch64_toolchain//:aarch64-qnx-sdp_8.0.0-posix
 test:bl-aarch64-qnx --config=bl_common
+
+# Coverage configuration for C++
+coverage --features=coverage
+coverage --combined_report=lcov
+coverage --cache_test_results=no

.github/workflows/coverage_report.yml

@@ -0,0 +1,59 @@
+# *******************************************************************************
+# Copyright (c) 2026 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+name: Code Coverage
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+  push:
+    branches:
+      - main
+  merge_group:
+    types: [checks_requested]
+jobs:
+  coverage-report:
+    runs-on: ubuntu-22.04
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v6
+      - name: Install lcov
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y lcov
+      - name: Setup Bazel
+        uses: bazel-contrib/[email protected]
+        with:
+          bazelisk-cache: true
+          disk-cache: ${{ github.workflow }}
+          repository-cache: true
+          cache-save: ${{ github.event_name != 'pull_request' }}
+      - name: Run Bazel Coverage
+        run: |
+          bazel coverage --config=bl-x86_64-linux -- //score/... \
+          -//score/language/safecpp/aborts_upon_exception:abortsuponexception_toolchain_test
+      - name: Generate HTML Coverage Report
+        run: |
+          genhtml "$(bazel info output_path)/_coverage/_coverage_report.dat" \
+            -o=cpp_coverage \
+            --show-details \
+            --legend \
+            --function-coverage \
+            --branch-coverage
+        shell: bash
+      - name: Upload Coverage Artifacts
+        uses: actions/upload-artifact@v6
+        with:
+          name: ${{ github.event.repository.name }}_coverage_report
+          path: cpp_coverage/
+          retention-days: 30