chore: consolidate some CI workflows to reduce sprawl (#6696)

Author: TomAFrench

.github/workflows/formatting.yml

@@ -15,37 +15,53 @@ concurrency:
 jobs:
   clippy:
     name: cargo clippy
-    runs-on: ${{ matrix.runner }}
+    runs-on: ubuntu-latest
     timeout-minutes: 30
     env:
       RUSTFLAGS: -Dwarnings
 
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - runner: ubuntu-latest
-            target: x86_64-unknown-linux-gnu
-
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
       - name: Setup toolchain
         uses: dtolnay/rust-toolchain@1.74.1
         with:
-          targets: ${{ matrix.target }}
+          targets: x86_64-unknown-linux-gnu
           components: clippy, rustfmt
 
       - uses: Swatinem/rust-cache@v2
         with:
-          key: ${{ matrix.target }}
+          key: x86_64-unknown-linux-gnu
           cache-on-failure: true
           save-if: ${{ github.event_name != 'merge_group' }}
 
       - name: Run `cargo clippy`
         run: cargo clippy --all-targets --workspace --locked --release
 
+  rustfmt:
+    name: cargo fmt
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    env:
+      RUSTFLAGS: -Dwarnings
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup toolchain
+        uses: dtolnay/rust-toolchain@1.74.1
+        with:
+          targets: x86_64-unknown-linux-gnu
+          components: clippy, rustfmt
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: x86_64-unknown-linux-gnu
+          cache-on-failure: true
+          save-if: ${{ github.event_name != 'merge_group' }}
+
       - name: Run `cargo fmt`
         run: cargo fmt --all --check
 
@@ -88,7 +104,6 @@ jobs:
         run: |
           mkdir dist
           cp ./target/release/nargo ./dist/nargo
-          7z a -ttar -so -an ./dist/* | 7z a -si ./nargo-x86_64-unknown-linux-gnu.tar.gz
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4