Support for windows images for tags (#346)

scripts/windows/latest.ps1

@@ -0,0 +1,30 @@
+# this script is used by the continuous integration server to
+# build and publish the docker image for a commit to master.
+
+$env:GOOS="windows"
+$env:GOARCH="amd64"
+$env:CGO_ENABLED="0"
+
+if (-not (Test-Path env:VERSION)) {
+    $env:VERSION="1809"
+}
+
+if (-not (Test-Path env:REGISTRY)) {
+    $env:REGISTRY="docker"
+}
+
+
+echo $env:GOOS
+echo $env:GOARCH
+echo $env:VERSION
+
+# build the binary
+go build -o release/windows/amd64/drone-$env:REGISTRY.exe
+
+# build and publish the docker image
+docker login -u $env:USERNAME -p $env:PASSWORD
+docker build -f docker/$env:REGISTRY/Dockerfile.windows.amd64.$env:VERSION -t plugins/$env:REGISTRY:windows-$env:VERSION-amd64 .
+docker push plugins/$env:REGISTRY:windows-$env:VERSION-amd64
+
+# remove images from local cache
+docker rmi plugins/$env:REGISTRY:windows-$env:VERSION-amd64