Add artifact upload step to Ubuntu workflow

Added step to upload build artifact for Ubuntu workflow.

Author: eusebioleite

.github/workflows/ubuntu.yml

@@ -0,0 +1,26 @@
+name: Rust
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build
+      run: cargo build --verbose
+      
+    - name: Upload Artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: ubuntu-binary
+        path: target/release/qr_rs