added github actions demo

.github/workflows/github-actions-demo.yml

@@ -0,0 +1,22 @@
+name: Go
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: '^1.21'
+    - name: Build
+      run: cd ../../Day-11/go-rest-api && go build -o myapp
+    # - name: Test
+    #   run: go test -v ./...