ci: add job to check semver compatibility

Author: djc

.github/workflows/rust.yml

@@ -76,6 +76,17 @@ jobs:
     - uses: dtolnay/rust-toolchain@1.60.0
     - run: cargo build --all-features --lib
 
+  semver:
+    name: Check semver compatibility
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Check semver
+        uses: obi1kenobi/cargo-semver-checks-action@v2
+
 #  TODO: broken - migrate to criterion
 #  bench:
 #    name: Check that benchmarks compile