move rustfmt into its own job as well

.github/workflows/pr.yml

@@ -5,6 +5,27 @@ on:
   workflow_dispatch:
 
 jobs:
+  rustfmt:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the proper directory
+        uses: actions/checkout@v3
+        with:
+          submodules: 'recursive'
+
+      - name: Cache rust
+        uses: Swatinem/rust-cache@v2
+
+      - name: Install rust
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          components: rustfmt
+
+      - name: Check formatting
+        run: cargo fmt --check
+
+
   clippy:
     strategy:
       fail-fast: false
@@ -25,10 +46,7 @@ jobs:
         uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust-version }}
-          components: rustfmt, clippy
-
-      - name: Check formatting
-        run: cargo fmt --check
+          components: clippy
 
       - name: Check clippy lints
         run: cargo clippy
@@ -53,7 +71,6 @@ jobs:
         uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust-version }}
-          components: rustfmt
 
       - name: Check build
         run: cargo build --verbose