try again annoying github ci

.github/workflows/tests.yml

@@ -7,15 +7,6 @@ on:
     branches: [ "master" ]
 
 jobs:
-  prepare-gcc-13:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Install gcc-13
-        run: >
-          sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-          sudo apt-get update -y
-          sudo apt-get install gcc-13
-
   build:
     runs-on: ${{ matrix.os }}
 
@@ -42,6 +33,13 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
+    - name: Install gcc-13
+      if: {{ matrix.os }} == 'ubuntu-latest'
+      run: >
+          sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y &&
+          sudo apt-get update -y && 
+          sudo apt-get install gcc-13
+
     - name: Install Conan
       run: pip install conan