Add complete downstream API gate

.gitea/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: Rust API gates
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  api-gates:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@1.85.0
+        with:
+          components: clippy,rustfmt
+      - name: Generated mapping and API coverage
+        run: |
+          python3 tools/generate_rust_mapping.py --check
+          python3 tools/generate_api_shims.py --check
+          python3 tools/check_api_coverage.py
+      - name: Formatting
+        run: cargo fmt --all -- --check
+      - name: Workspace check
+        run: cargo check --workspace --all-targets
+      - name: Downstream API fixture
+        run: cargo check --locked --manifest-path tests/api-compile/Cargo.toml
+      - name: Test compilation
+        run: cargo test --workspace --no-run
+      - name: Clippy
+        run: cargo clippy --workspace --all-targets --all-features -- -D warnings
+      - name: Documentation
+        run: cargo doc --workspace --no-deps