CI speed optimization

.github/workflows/msrv.yml

@@ -6,130 +6,74 @@ jobs:
   check:
     name: Check
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        rust:
-          - 1.70.0
-          - stable
-          - beta
-          - nightly
-
     steps:
       - name: Checkout sources
         uses: actions/[email protected]
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: ${{ matrix.rust }}
+          toolchain: 1.70.0
 
-      - name: Run cargo check
-        if: matrix.rust != 'nightly'
-        run: cargo check --all-features
+      - name: Cache
+        uses: Swatinem/rust-cache@v2
 
-      - name: Run cargo check (nightly)
-        if: matrix.rust == 'nightly'
-        continue-on-error: true
-        run: cargo check --all-features
+      - name: Run cargo check
+        run: cargo check --all-features --examples --tests
 
   test:
-    needs: [check]
     name: Test Suite
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        rust:
-          - 1.70.0
-          - stable
-          - beta
-          - nightly
     steps:
       - name: Checkout sources
         uses: actions/[email protected]
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: ${{ matrix.rust }}
-
-      - name: Run cargo test
-        if: matrix.rust != 'nightly' && matrix.rust != '1.56.1'
-        run: cargo test --all-features
+          toolchain: 1.70.0
 
-      - name: Run cargo test (nightly)
-        if: matrix.rust == '1.66.0'
-        continue-on-error: true
-        run: cargo test --tests --all-features
+      - name: Cache
+        uses: Swatinem/rust-cache@v2
 
-      - name: Run cargo test (nightly)
-        if: matrix.rust == 'nightly'
-        continue-on-error: true
+      - name: Run cargo test
         run: cargo test --all-features
 
   fmt:
     needs: [check]
     name: Rustfmt
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        rust:
-          - stable
-          - beta
     steps:
       - name: Checkout sources
         uses: actions/[email protected]
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: ${{ matrix.rust }}
+          toolchain: 1.70.0
           components: rustfmt
 
       - name: Run cargo fmt
+        continue-on-error: ${{ matrix.rust == 'beta' }}
         run: cargo fmt --all -- --check
 
   clippy:
     needs: [check]
     name: Clippy
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        rust:
-          - 1.70.0
-          - 1.73.0
     steps:
       - name: Checkout sources
         uses: actions/[email protected]
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: ${{ matrix.rust }}
+          toolchain: 1.70.0
           components: clippy
 
+      - name: Cache
+        uses: Swatinem/rust-cache@v2
+
       - name: Run cargo clippy
         run: cargo clippy --all-targets --all-features -- -D warnings
 
-  check-examples:
-    name: Check examples
-    needs: [check]
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        rust:
-          - 1.70.0
-          - 1.73.0
-
-    steps:
-      - name: Checkout sources
-        uses: actions/[email protected]
-
-      - name: Install toolchain
-        uses: dtolnay/rust-toolchain@master
-        with:
-          toolchain: ${{ matrix.rust }}
-          components: clippy
-
-      - name: Run cargo check
-        run: cargo check --examples
-