GitHub Action: Completion of security analysis with CodeQL (#1300)

Adds analysis for C/C++ and Python.

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,54 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master,  releasebranch_7_8]
+  pull_request:
+    branches: [ master ]
+  schedule:
+    # Check every Saturday at 18:36
+    - cron: '36 18 * * 6'
+
+jobs:
+  analyze:
+    name: ${{ matrix.language }}
+    runs-on: ubuntu-20.04
+
+    strategy:
+      fail-fast: false
+      matrix:
+        # C is included in cpp, no separate C language available on CodeQL
+        language: [ 'cpp', 'python' ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+
+    - name: Get dependencies
+      run: |
+        sudo apt-get update -y
+        sudo apt-get install -y wget git gawk findutils
+        xargs -a <(awk '! /^ *(#|$)/' ".github/workflows/apt.txt") -r -- \
+            sudo apt-get install -y --no-install-recommends --no-install-suggests
+
+    - name: Create installation directory
+      run: |
+        mkdir $HOME/install
+
+    - name: Set LD_LIBRARY_PATH for compilation
+      run: |
+        echo "LD_LIBRARY_PATH=$HOME/install/lib" >> $GITHUB_ENV
+
+    - name: Build
+      env:
+        CFLAGS: "-std=gnu11"
+        CXXFLAGS: "-std=c++11"
+      run: .github/workflows/build.sh $HOME/install
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1