Don't build on CI, but check MSRV

Author: clechasseur

.github/workflows/ci.yml

@@ -57,50 +57,34 @@ jobs:
         with:
           args: --all
 
-  build:
-    name: Build for Rust ${{ matrix.toolchain }}${{ matrix.experimental && ' (experimental)' || '' }} on ${{ matrix.os }}${{ matrix.ignore-lock && ' without Cargo.lock' || '' }}${{ matrix.all-features && ' with all features' || '' }}
+  msrv-check:
+    name: MSRV check for Rust ${{ matrix.toolchain }} on ${{ matrix.os }}${{ matrix.all-features && ' with all features' || '' }}
     strategy:
       fail-fast: false
       matrix:
-        toolchain: [ 1.70.0, stable ]
-        os: [ ubuntu ]
-        ignore-lock: [ false ]
-        all-features: [ true ]
-        include:
-          - experimental: false
+        toolchain: [ 1.70.0 ]
+        os: [ ubuntu, macos, windows ]
+        all-features: [ false, true ]
     runs-on: ${{ matrix.os }}-latest
-    continue-on-error: ${{ matrix.experimental }}
     steps:
       - name: Checkout code
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
-      - name: Remove Cargo.lock
-        if: ${{ matrix.ignore-lock }}
-        run: rm Cargo.lock
-
-      - name: Install Rust ${{ matrix.toolchain }}
+      - name: Install Rust nightly and ${{ matrix.toolchain }}
         uses: actions-rust-lang/setup-rust-toolchain@11df97af8e8102fd60b60a77dfbf58d40cd843b8 # v1.10.1
         with:
-          toolchain: ${{ matrix.toolchain }}
+          toolchain: nightly,${{ matrix.toolchain }}
           cache: false
 
       - name: Rust Cache
-        if: ${{ !matrix.experimental }}
         uses: Swatinem/rust-cache@82a92a6e8fbeee089604da2575dc567ae9ddeaab # v2.7.5
         with:
-          prefix-key: v2-rust
-          key: ignore-lock-${{ matrix.ignore-lock }}-all-features-${{ matrix.all-features }}
+          prefix-key: v8-rust
+          key: all-features-${{ matrix.all-features }}
           cache-on-failure: true
 
-      - name: Install just
-        uses: taiki-e/install-action@678b06b887cdbf44fa0601e5915f865e17c2241d # v2.44.60
-        with:
-          tool: just
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
       - name: Run checks
-        run: just all_features=${{ matrix.all-features }} check
-
-      - name: Run tests
-        run: just all_features=${{ matrix.all-features }} test
+        uses: clechasseur/rs-cargo@8435b10f6e71c2e3d4d3b7573003a8ce4bfc6386 # v2.0.6
+        with:
+          command: check
+          args: --workspace ${{ matrix.all-features && '--all-features' || '' }}