Try gcc 12 on a different linux image

.github/workflows/ci.yml

@@ -7,12 +7,35 @@ on:
     branches: [ "master", "dev" ]
 
 jobs:
-  build:
+  linux_ubuntu_20_04:
     name: Linux GCC ${{ matrix.gcc-version }}
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        gcc-version: [9, 10, 11, 12, 13]
+        gcc-version: [9, 10, 11, 13] # 12 doesn't work for some reason
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install GCC ${{ matrix.gcc-version }}
+      run: |
+        sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
+        sudo apt update
+        sudo apt install -y gcc-${{ matrix.gcc-version }} g++-${{ matrix.gcc-version }}
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-${{ matrix.gcc-version }} 100 --slave /usr/bin/g++ g++ /usr/bin/g++-${{ matrix.gcc-version }} 
+        sudo update-alternatives --set gcc /usr/bin/gcc-${{ matrix.gcc-version }}
+
+    - name: Install dependencies
+      run: sudo apt-get update && sudo apt-get install -y libsdl2-dev
+
+    - name: Build project
+      run: make -j$(nproc)
+
+  linux_ubuntu_22_04:
+    name: Linux GCC ${{ matrix.gcc-version }}
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        gcc-version: [12]
     steps:
     - uses: actions/checkout@v4
 
@@ -34,3 +57,4 @@ jobs:
 
     - name: Build project
       run: make -j$(nproc)
+