set workflow to publish when github ver published

.github/workflows/rust.yml

@@ -1,10 +1,6 @@
 name: Rust
 
 on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
   release:
     types: [ published ]
 
@@ -22,3 +18,5 @@ jobs:
       run: cargo build --verbose
     - name: Run tests
       run: cargo test --verbose
+    - name: publish
+      run: cargo publish --verbose