ci: simplify MSRV job configuration

.github/workflows/ci.yml

@@ -5,33 +5,37 @@ on:
   pull_request:
 
 jobs:
-  build-msrv:
-    name: Build on MSRV (1.71)
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - os: ubuntu-latest
-            target: x86_64-unknown-linux-gnu
-            rust: 1.71.0
-          - os: windows-latest
-            target: i686-pc-windows-msvc
-            rust: 1.71.0
-    runs-on: ${{ matrix.os }}
+  msrv:
+    name: MSRV
+    runs-on: ubuntu-latest
+    env:
+      # Matches Tier 1 job targets
+      TARGETS: |
+        aarch64-unknown-linux-gnu
+        i686-unknown-linux-gnu
+        x86_64-unknown-linux-gnu
+        i686-pc-windows-gnu
+        i686-pc-windows-msvc
+        x86_64-pc-windows-gnu
+        x86_64-pc-windows-msvc
+        x86_64-apple-darwin
     steps:
-      - name: Install rust
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: ${{ matrix.rust }}
-          target: ${{ matrix.target }}
-          override: true
       - name: Checkout
         uses: actions/checkout@v7
+      - uses: taiki-e/install-action@v2.87.11
+        with:
+          tool: |
+            cargo-hack
+            cargo-minimal-versions
+          fallback: none
       - name: Check
-        env:
-          CARGO_BUILD_TARGET: ${{ matrix.target }}
-        run: make check
+        run: |
+          cargo minimal-versions check \
+            --workspace \
+            --feature-powerset \
+            --ignore-private \
+            --rust-version \
+            $(printf '%s\n' "$TARGETS" | xargs -n1 printf -- '--target %s ')
 
   test:
     name: Tests