Update and rename rust.yml to build.yml

Original commit: ffa91f8183

gui/.github/workflows/build.yml

@@ -0,0 +1,20 @@
+name: Build (MacOS, Linux, Windows)
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix: 
+        os: [windows-latest, macOS-latest, ubuntu-latest]
+        rust: [nightly]
+    steps:
+    - uses: hecrj/setup-rust-action@v1
+      with:
+        rust-version: ${{ matrix.rust }}
+    - uses: actions/checkout@v1
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose