ci: Cache xtask and reuse it between jobs

.github/workflows/ci.yml

@@ -10,8 +10,37 @@ on:
     branches: [main, next]
 
 jobs:
+  xtask:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Check xtask cache
+        uses: actions/cache@v3
+        id: xtask-cache
+        with:
+          path: target/debug/xtask
+          key: xtask-${{ hashFiles('xtask/src/**', 'xtask/Cargo.toml') }}
+
+      - name: Install rust stable toolchain
+        if: steps.xtask-cache.outputs.cache-hit != 'true'
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+
+      - name: Build
+        if: steps.xtask-cache.outputs.cache-hit != 'true'
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: -p xtask
+
   style:
     name: Style
+    needs: xtask
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
@@ -34,14 +63,18 @@ jobs:
         with:
           crate: cargo-sort
 
-      - name: Run lints
+      - name: Get xtask
-        uses: actions-rs/cargo@v1
+        uses: actions/cache@v3
         with:
-          command: run
+          path: target/debug/xtask
-          args: -p xtask --no-default-features ci lint
+          key: xtask-${{ hashFiles('xtask/src/**', 'xtask/Cargo.toml') }}
+
+      - name: Run lints
+        run: target/debug/xtask ci lint
   
   msrv:
     name: Rust 1.60 / ${{ matrix.name }}
+    needs: xtask
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -86,14 +119,18 @@ jobs:
           # fresh cache.
           sharedKey: msrv1.60
 
-      - name: Run checks
+      - name: Get xtask
-        uses: actions-rs/cargo@v1
+        uses: actions/cache@v3
         with:
-          command: run
+          path: target/debug/xtask
-          args: -p xtask --no-default-features ci ${{ matrix.cmd }}
+          key: xtask-${{ hashFiles('xtask/src/**', 'xtask/Cargo.toml') }}
+
+      - name: Run checks
+        run: target/debug/xtask ci ${{ matrix.cmd }}
 
   stable:
     name: Rust Stable / ${{ matrix.name }}
+    needs: xtask
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -129,14 +166,18 @@ jobs:
 
       - uses: Swatinem/rust-cache@v1
 
-      - name: Run checks
+      - name: Get xtask
-        uses: actions-rs/cargo@v1
+        uses: actions/cache@v3
         with:
-          command: run
+          path: target/debug/xtask
-          args: -p xtask --no-default-features ci ${{ matrix.cmd }}
+          key: xtask-${{ hashFiles('xtask/src/**', 'xtask/Cargo.toml') }}
+
+      - name: Run checks
+        run: target/debug/xtask ci ${{ matrix.cmd }}
 
   nightly:
     name: Rust Nightly / ${{ matrix.name }}
+    needs: xtask
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -173,14 +214,18 @@ jobs:
 
       - uses: Swatinem/rust-cache@v1
 
-      - name: Run checks
+      - name: Get xtask
-        uses: actions-rs/cargo@v1
+        uses: actions/cache@v3
         with:
-          command: run
+          path: target/debug/xtask
-          args: -p xtask --no-default-features ci ${{ matrix.cmd }}
+          key: xtask-${{ hashFiles('xtask/src/**', 'xtask/Cargo.toml') }}
+
+      - name: Run checks
+        run: target/debug/xtask ci ${{ matrix.cmd }}
 
   docs:
     name: Docs
+    needs: xtask
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
@@ -196,11 +241,14 @@ jobs:
 
       - uses: Swatinem/rust-cache@v1
 
-      - name: Build docs
+      - name: Get xtask
-        uses: actions-rs/cargo@v1
+        uses: actions/cache@v3
         with:
-          command: run
+          path: target/debug/xtask
-          args: -p xtask --no-default-features -- doc --deny-warnings
+          key: xtask-${{ hashFiles('xtask/src/**', 'xtask/Cargo.toml') }}
+
+      - name: Build docs
+        run: target/debug/xtask doc --deny-warnings
 
       - name: Deploy to docs branch
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}