update github actions

.github/workflows/rust.yml

@@ -1,19 +1,46 @@
 name: Rust
 
 on:
-  push:
-    branches: [ master ]
   pull_request:
-    branches: [ master ]
+    branches:
+      - master
+  push:
+    branches:
+      - master
 
 jobs:
-  build:
+  rust:
+    name: Rust project
 
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v2
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose
+
+    - name: Install OS deps
+      run: sudo apt update -y && sudo apt install -y libpq-dev
+
+    - name: Install Rust stable
+      run: rustup update stable && rustup default stable
+
+    - name: Cache cargo registry
+      uses: actions/cache@v1
+      with:
+        path: ~/.cargo/registry
+        key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+    - name: Cache cargo index
+      uses: actions/cache@v1
+      with:
+        path: ~/.cargo/git
+        key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+    - name: Cache cargo build
+      uses: actions/cache@v1
+      with:
+        path: target
+        key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Run rustfmt
+      run: cargo fmt --all -- --check
+
+    - name: Run the test suite
+      run: cargo test --all