Add compliance check for windows to ensure cross platform build (#14260)

* Add compliance check for windows to ensure cross platform build

* no race condition

* woops. meant to change windows, not arm64

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

.drone.yml

@@ -97,6 +97,18 @@ steps:
       - rm ./gitea # clean
     depends_on: [checks-backend]
 
+  - name: build-backend-windows
+    image: golang:1.15
+    environment:
+      GO111MODULE: on
+      GOPROXY: off
+      GOOS: windows
+      GOARCH: amd64
+      TAGS: bindata gogit
+    commands:
+      - go build -mod=vendor -o gitea_windows
+    depends_on: [checks-backend]
+
   - name: build-backend-386
     image: golang:1.15
     environment: