Add "test" CI stage

Author: dmitry-markin

.github/workflows/check.yml

@@ -50,7 +50,6 @@ jobs:
           toolchain: stable
           override: true
 
-      # Rust cache
       - name: Rust cache
         uses: Swatinem/rust-cache@v2
         with:
@@ -70,7 +69,6 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v4
 
-      # Rust cache
       - name: Rust cache
         uses: Swatinem/rust-cache@v2
         with:
@@ -81,3 +79,24 @@ jobs:
         run: >
           cd node &&
           cargo check --features=runtime-benchmarks
+
+    test:
+      name: Test
+      runs-on: parity-default
+      timeout-minutes: 15
+      needs: [set-image]
+      container:
+        image: ${{ needs.set-image.outputs.CI_IMAGE }}
+      steps:
+        - name: Checkout sources
+          uses: actions/checkout@v4
+
+        - name: Rust cache
+          uses: Swatinem/rust-cache@v2
+          with:
+            cache-on-failure: true
+            cache-all-crates: true
+
+        # TODO: enable `--all-features`.
+        - name: Run tests
+          run: cargo test --workspace