add 1809 windows build

.drone.yml

@@ -32,6 +32,38 @@ trigger:
   event:
   - push
 
+---
+kind: pipeline
+type: ssh
+name: windows-1809-amd64
+
+platform:
+  os: windows
+
+server:
+  host:
+    from_secret: windows_server_1809
+  password:
+    from_secret: windows_password
+  user:
+    from_secret: windows_username
+
+steps:
+- name: build
+  commands:
+  - docker login -u $env:USERNAME -p $env:PASSWORD
+  - docker build -f docker/Dockerfile.windows.1809 -t drone/git:windows-1809-amd64 .
+  - docker push drone/git:windows-1809-amd64
+  environment:
+    USERNAME:
+      from_secret: docker_username
+    PASSWORD:
+      from_secret: docker_password
+
+trigger:
+  event:
+  - push
+
 ---
 kind: pipeline
 type: docker
@@ -56,3 +88,4 @@ trigger:
 
 depends_on:
 - windows-1903-amd64
+- windows-1809-amd64