ci: this time for real for real

.github/workflows/main.yml

@@ -15,8 +15,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
-        # os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-20.04, windows-2022, macos-12]
     runs-on: ${{matrix.os}}
     steps:
       - uses: goto-bus-stop/setup-zig@v2
@@ -31,7 +30,7 @@ jobs:
         if: runner.os == 'Linux'
         run: |
             sudo apt update
-            sudo apt install libgtk-3-dev libsdl2-dev
+            sudo apt install libgtk-3-dev libsdl2-dev pkg-config
       - name: prepare-windows
         if: runner.os == 'Windows'
         run: |
@@ -58,6 +57,5 @@ jobs:
           submodules: recursive
       - uses: goto-bus-stop/setup-zig@v2
         with:
-          version: 0.11.0-dev.3395+1e7dcaa3a
-      - run: zig fmt src/**/*.zig
-  
+          version: 0.12.0-dev.2063+804cee3b9
+      - run: zig fmt --check {src,lib}/**/*.zig build.zig build.zig.zon