Add cache, test step.

Author: brndnmtthws

.github/workflows/build-and-test.yml

@@ -7,10 +7,14 @@ jobs:
     name: Rust project
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+      - uses: Swatinem/rust-cache@v2
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
       - uses: actions-rs/cargo@v1
         with:
           command: build