Add semver-checks action

.github/workflows/ci.yml

@@ -95,3 +95,17 @@ jobs:
         with:
           command: fmt
           args: --all -- --check
+
+  semver:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+          components: rustfmt
+          profile: minimal
+          override: true
+      - uses: obi1kenobi/cargo-semver-checks-action@v2
+        with:
+          args: --all-features --package manul