ci: adapt to nix native runner

.github/workflows/check-spv.yml

@@ -12,18 +12,10 @@ env:
 
 jobs:
   check-spv:
-    runs-on: ubuntu-latest
+    runs-on: native
     steps:
     - uses: actions/checkout@v2
-    - name: Show env
-      run: |
-        uname -a
-        ldd --version
-    - name: Install
-      run: |
-        curl https://sh.rustup.rs -sSf | sh -s -- -y
-        echo "$HOME/.cargo/bin" >> $GITHUB_PATH
     - name: Check
       run: |
-        cargo run --manifest-path compile-shaders/Cargo.toml -p compile-shaders-core
+        nix develop . --command cargo run --manifest-path compile-shaders/Cargo.toml -p compile-shaders-core
         git diff --exit-code