cached workflow, renamed file

Author: yomarion

.github/workflows/build-and-test.yml renamed to .github/workflows/main.yml

@@ -19,6 +19,16 @@ jobs:
     - name: Rust downgrade
       run: rustup default 1.67.0
     - uses: actions/checkout@v3
+    - uses: actions/cache@v3
+      id: cache
+      with:
+        path: |
+          ~/.cargo/bin/
+          ~/.cargo/registry/index/
+          ~/.cargo/registry/cache/
+          ~/.cargo/git/db/
+          target/
+        key: cargo-${{ hashFiles('**/Cargo.lock') }}
     - name: Install wasm32-unknown-unknown target
       run: rustup target add wasm32-unknown-unknown
     - name: Build contracts