CI: Add cargo-semver-checks job.

Author: briansmith

.github/workflows/ci.yml

@@ -62,6 +62,28 @@ jobs:
 
       - run: cargo audit --deny warnings
 
+  cargo-semver-checks:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - run: rustup --version
+
+      - uses: briansmith/actions-cache@v3
+        with:
+          path: |
+            ~/.cargo/bin/cargo-semver-checks
+            ~/.cargo/.crates.toml
+            ~/.cargo/.crates2.json
+          key: ${{ runner.os }}-v2-cargo-audit-locked-0.18.3
+
+      - run: cargo install cargo-semver-checks --locked --vers "0.31.0"
+
+      - uses: briansmith/actions-checkout@v4
+        with:
+          persist-credentials: false
+
+      - run: cargo semver-checks
+
   deny:
     # Don't run duplicate `push` jobs for the repo owner's PRs.
     if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository