ci: build-nix and test are not matrix tests

.github/workflows/test.yml

@@ -41,10 +41,7 @@ jobs:
         run: nix develop -c zig build -Dstatic=true -Dapp-runtime=glfw -Dtarget=${{ matrix.target }}
 
   build-nix:
-    strategy:
-      matrix:
-        os: [ubuntu-latest]
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     needs: test
     steps:
       - name: Checkout code
@@ -144,10 +141,7 @@ jobs:
         run: Get-Content -Path ".\build.log"
 
   test:
-    strategy:
-      matrix:
-        os: [ubuntu-latest]
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v4