chore(ci): add minimal versions checking

Author: tottoto

.github/workflows/CI.yml

@@ -26,6 +26,7 @@ jobs:
       - doc
       - check-external-types
       - udeps
+      - minimal-versions
     steps:
       - run: exit 0
 
@@ -272,3 +273,16 @@ jobs:
 
       - name: Check unused dependencies on full features
         run: cargo udeps --features full
+
+  minimal-versions:
+    runs-on: ubuntu-latest
+    needs: [style]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: taiki-e/install-action@cargo-hack
+      - uses: taiki-e/install-action@cargo-minimal-versions
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo minimal-versions check
+      - run: cargo minimal-versions check --features full