Use compile_commands.json with clang-tidy

Otherwise it can't find headers. Also reduce the number of steps using features
of clang-tidy-review.

.github/workflows/clang-tidy.yaml

@@ -4,49 +4,17 @@ on: [pull_request]
 jobs:
   build:
     name: clang-tidy
-    strategy:
-      matrix:
-        os: [ubuntu-latest]
-        compiler: [gcc]
-        build_type: [Debug]
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     steps:
-      - name: Set base_dir
-        run: echo "base_dir=$(pwd)" >> $GITHUB_ENV
-
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
-      - name: Install GCC
-        if: ${{ matrix.compiler == 'gcc' }}
-        run: |
-          sudo apt-get install g++
-      - name: Install dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install \
-            cmake \
-            ninja-build \
-            python3 \
-            gettext \
-            qtbase5-dev \
-            libqt5svg5-dev \
-            libkf5archive-dev \
-            liblua5.3-dev \
-            libsqlite3-dev \
-            libsdl2-mixer-dev
-      - name: Configure
-        run: |
-          cmake . -B build -G Ninja \
-            -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} \
-            -DCMAKE_EXPORT_COMPILE_COMMANDS=on
-      - name: Build
-        run: |
-          cmake --build build
-      - uses: ZedThree/[email protected]
+
+      - uses: ZedThree/[email protected]
         id: review
         with:
-          # Tell clang-tidy-review the base directory.
-          # This will get replaced by the new working
-          # directory inside the action
-          base_dir: ${{ matrix.base_dir }}
+          apt_packages: 'cmake,ninja-build,python3,g++,gettext,qtbase5-dev,libqt5svg5-dev,libkf5archive-dev,liblua5.3-dev,libsqlite3-dev,libsdl2-mixer-dev'
+
+          # Tell clang-tidy-review the build directory, so it finds the
+          # compilation database.
+          build_dir: build