build-system: add GitHub scanning

.github/workflows/codeql-analysis.yml

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+# Modified from the sample workflow suggested by GitHub/Semmle
+#
+name: "CodeQL"
+
+on:
+  push:
+    # once this works, this should be
+    # branches: [master]
+    branches: [master, codeQL]
+
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [master]
+
+  schedule:
+    - cron: '0 2 * * 6'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        # Override automatic language detection by changing the below list
+        # Supported options are ['csharp', 'cpp', 'go', 'java', 'javascript', 'python']
+        language: ['cpp', 'javascript']
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+      with:
+        # We must fetch at least the immediate parents so that if this is
+        # a pull request then we can checkout the head.
+        fetch-depth: 2
+
+    - name: get container ready for build
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y -q --force-yes \
+        autoconf automake cmake g++ git libcrypto++-dev libcurl4-gnutls-dev \
+        libgit2-dev libqt5qml5 libqt5quick5 libqt5svg5-dev \
+        libqt5webkit5-dev libsqlite3-dev libssh2-1-dev libssl-dev libssl-dev \
+        libtool libusb-1.0-0-dev libxml2-dev libxslt1-dev libzip-dev make \
+        pkg-config qml-module-qtlocation qml-module-qtpositioning \
+        qml-module-qtquick2 qt5-default qt5-qmake qtchooser qtconnectivity5-dev \
+        qtdeclarative5-dev qtdeclarative5-private-dev qtlocation5-dev \
+        qtpositioning5-dev qtscript5-dev qttools5-dev qttools5-dev-tools \
+        qtquickcontrols2-5-dev xvfb libbluetooth-dev
+
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    - name: Build
+      run: |
+        cd ..
+        bash -e -x subsurface/scripts/build.sh -desktop -build-with-webkit
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1