chore(ci): add simple release CI

.github/workflows/release.yml

@@ -0,0 +1,28 @@
+name: Rust static release
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  CARGO_TERM_COLOR: always
+  BUILD_TARGET: x86_64-unknown-linux-musl
+  BINARY_NAME: Mutiny
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build musl binary
+      uses: gmiam/rust-musl-action@master
+      with:
+        args: cargo build --target $BUILD_TARGET --release
+
+    - uses: actions/upload-artifact@v2
+      with:
+        name: ${{ env.BINARY_NAME }}
+        path: target/x86_64-unknown-linux-musl/release/${{ env.BINARY_NAME }}*