Merge pull request #1 from loichyan/ci/msrv-checks

Add checks of MSRV in CI

Author: equation314

.github/workflows/ci.yml

@@ -3,13 +3,40 @@ name: CI
 on: [push, pull_request]
 
 jobs:
+  metadata:
+    name: Extract crate metadata
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Extract crate metadata
+        id: metadata
+        run: |
+          cargo metadata --no-deps --format-version=1 \
+            | jq -r '.packages[0]
+              | {name, version, rust_version}
+              | to_entries
+              | map("\(.key)=\(.value)")
+              | join("\n")' \
+            | tee -a $GITHUB_OUTPUT
+    outputs:
+      name: ${{ steps.metadata.outputs.name }}
+      version: ${{ steps.metadata.outputs.version }}
+      rust_version: ${{ steps.metadata.outputs.rust_version }}
+
   ci:
+    needs: [metadata]
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        rust-toolchain: [nightly]
+        rust-toolchain: [nightly, "${{ needs.metadata.outputs.rust_version }}"]
         targets: [x86_64-unknown-linux-gnu, x86_64-unknown-none, riscv64gc-unknown-none-elf, aarch64-unknown-none-softfloat]
+        exclude:
+          # component 'rust-std' for target 'x86_64-unknown-none' is unavailable for channel '1.57'
+          - rust-toolchain: "${{ needs.metadata.outputs.rust_version }}"
+            targets: x86_64-unknown-none
     steps:
     - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@nightly
@@ -26,7 +53,7 @@ jobs:
     - name: Build
       run: cargo build --target ${{ matrix.targets }} --all-features
     - name: Unit test
-      if: ${{ matrix.targets == 'x86_64-unknown-linux-gnu' }}
+      if: ${{ matrix.targets == 'x86_64-unknown-linux-gnu' && matrix.rust-toolchain != '${{ needs.metadata.outputs.rust_version }}' }}
       run: cargo test --target ${{ matrix.targets }} -- --nocapture
 
   doc: