Add CI build for CMake 3.5 with GCC 5.3

.github/workflows/build.yml

@@ -90,6 +90,32 @@ jobs:
           cd bin/Linux
           ./AutomatedTest null
 
+  linux-minimum-cmake:
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:bionic
+      env: { LANG: "C.UTF-8" }
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install deps
+        run: |
+          apt-get update
+          apt-get install g++-5 ninja-build libidn11 libxi-dev libgl1-mesa-dev libpng-dev libjpeg-dev zlib1g-dev -qyy
+
+      - name: Setup CMake
+        uses: jwlawson/actions-setup-cmake@v1.13
+        with:
+          cmake-version: "3.5.x"
+
+      - name: Build
+        run: |
+          cmake -G Ninja -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 -DCMAKE_BUILD_TYPE=Release .
+          cmake --build .
+
+      - name: Test
+        run: |
+          ./bin/Linux/tests
+
   win32:
     runs-on: ubuntu-20.04
     steps: