Generate a coverage report in CI

Author: Rangi42

.github/workflows/coverage.yml

@@ -0,0 +1,29 @@
+name: Code coverage
+on:
+  - push
+  - pull_request
+
+jobs:
+  coverage:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+      - name: Install deps
+        shell: bash
+        run: |
+          ./.github/scripts/install_deps.sh ubuntu-22.04
+      - name: Install LCOV
+        run: |
+          sudo apt-get install lcov
+      - name: Generate coverage report
+        run: |
+          ./contrib/coverage.bash false
+      - name: Package coverage report
+        run: |
+          zip -r rgbds-coverage.zip coverage
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage
+          path: rgbds-coverage.zip

contrib/coverage.bash

@@ -20,8 +20,10 @@ lcov -c --no-external -d . -o coverage/coverage.info --ignore-errors format,inco
 genhtml -f -s -o coverage/ coverage/coverage.info --ignore-errors category,corrupt,inconsistent
 
 # Open report in web browser
-if [ "$(uname)" == "Darwin" ]; then
-  open coverage/index.html
-else
-  xdg-open coverage/index.html
+if [ "$1" != "false" ]; then
+  if [ "$(uname)" == "Darwin" ]; then
+    open coverage/index.html
+  else
+    xdg-open coverage/index.html
+  fi
 fi