Add a simple GH actions workflow

.github/workflows/rust.yml

@@ -0,0 +1,64 @@
+name: tokio-messaging
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  CARGO_TERM_COLOR: always
+  CARGO_TARGET_DIR: ~/cargo-target
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Cache
+      uses: actions/cache@v3.0.11
+      with:
+        path: |
+          ~/.cargo/bin/
+          ~/.cargo/registry/index/
+          ~/.cargo/registry/cache/
+          ~/.cargo/git/db/
+          ~/cargo-target/
+        key: "rust-check"
+    - uses: actions/checkout@v3
+    - name: Check
+      run: cargo check
+  build:
+    runs-on: ubuntu-latest
+    needs: check
+    steps:
+    - name: Cache
+      uses: actions/cache@v3.0.11
+      with:
+        path: |
+          ~/.cargo/bin/
+          ~/.cargo/registry/index/
+          ~/.cargo/registry/cache/
+          ~/.cargo/git/db/
+          ~/cargo-target/
+        key: "rust-build"
+# TODO: not needed for now
+#    - uses: actions/checkout@v3
+#    - name: Build
+#      run: cargo build
+  test:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+    - name: Cache
+      uses: actions/cache@v3.0.11
+      with:
+        path: |
+          ~/.cargo/bin/
+          ~/.cargo/registry/index/
+          ~/.cargo/registry/cache/
+          ~/.cargo/git/db/
+          ~/cargo-target/
+        key: "rust-build"
+    - uses: actions/checkout@v3
+    - name: Run unit tests
+      run: cargo test