ci: split cov tests and docs tests

To save some time thanks to workflow parallelism

Signed-off-by: Alexis Asseman <[email protected]>

.github/workflows/tests.yml

@@ -63,9 +63,26 @@ jobs:
         uses: taiki-e/install-action@cargo-llvm-cov
       - name: Run tests and generate coverage report
         run: cargo llvm-cov test --all-features --workspace --lcov --output-path lcov.info 
-      - name: Test documentation code snippets
-        run: cargo test --doc --all-features --workspace
       - name: Upload coverage to Coveralls
         uses: coverallsapp/[email protected]
         with:
           file: ./lcov.info
+
+  test-docs:
+    name: cargo test docs
+    runs-on: ubuntu-latest
+    container:
+      image: rust:1.74-bookworm
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-test-docs
+      - name: Test documentation code snippets
+        run: cargo test --doc --all-features --workspace