Add Windows CI

.drone.windows.jsonnet

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+local windows_pipe = '\\\\\\\\.\\\\pipe\\\\docker_engine';
+local windows_pipe_volume = 'docker_pipe';
+local versions = [
+  //'1803',
+  '1809',
+];
+local trigger = {
+  ref: [
+    'refs/heads/master',
+    'refs/tags/**',
+  ],
+};
+local pipeline_name(version) = 'Windows ' + version;
+
+local pipeline(version, arch) = {
+  kind: 'pipeline',
+  name: pipeline_name(version),
+
+  platform: {
+    os: 'windows',
+    arch: arch,
+    version: version,
+  },
+
+  steps: [{
+    name: 'git',
+    image: 'plugins/docker:windows-1809',  // TODO: This should just use the manifest
+    settings: {
+      repo: 'drone/git',
+      dockerfile: 'docker/Dockerfile.windows.' + version,
+      auto_tag: true,
+      auto_tag_suffix: 'windows-' + version + '-' + arch,
+
+      username: { from_secret: 'docker_username' },
+      password: { from_secret: 'docker_password' },
+
+      // Windows specific options
+      daemon_off: true,
+      purge: 'false',  // TODO: Fix bug where setting false won't generate the yaml value
+    },
+    volumes: [{ name: windows_pipe_volume, path: windows_pipe }],
+  }],
+
+  volumes: [{ name: windows_pipe_volume, host: { path: windows_pipe } }],
+  trigger: trigger,
+};
+
+[
+  pipeline(version, 'amd64')
+  for version in versions
+] + [
+  {
+    kind: 'pipeline',
+    name: 'Image Manifest',
+
+    steps: [{
+      name: 'manifest',
+      image: 'plugins/manifest',
+      settings: {
+        spec: 'docker/manifest.tmpl',
+        ignore_missing: true,
+
+        username: { from_secret: 'docker_username' },
+        password: { from_secret: 'docker_password' },
+      },
+    }],
+
+    depends_on: [
+      pipeline_name(version)
+      for version in versions
+    ],
+    trigger: trigger,
+  },
+]

.drone.windows.yml

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+---
+kind: pipeline
+name: Windows 1809
+
+platform:
+  os: windows
+  arch: amd64
+  version: 1809
+
+steps:
+- name: git
+  image: plugins/docker:windows-1809
+  settings:
+    auto_tag: true
+    auto_tag_suffix: windows-1809-amd64
+    daemon_off: true
+    dockerfile: docker/Dockerfile.windows.1809
+    password:
+      from_secret: docker_password
+    purge: false
+    repo: drone/git
+    username:
+      from_secret: docker_username
+  volumes:
+  - name: docker_pipe
+    path: \\\\.\\pipe\\docker_engine
+
+volumes:
+- name: docker_pipe
+  host:
+    path: \\\\.\\pipe\\docker_engine
+
+trigger:
+  ref:
+  - refs/heads/master
+  - "refs/tags/**"
+
+---
+kind: pipeline
+name: Image Manifest
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: manifest
+  image: plugins/manifest
+  settings:
+    ignore_missing: true
+    password:
+      from_secret: docker_password
+    spec: docker/manifest.tmpl
+    username:
+      from_secret: docker_username
+
+trigger:
+  ref:
+  - refs/heads/master
+  - "refs/tags/**"
+
+depends_on:
+- Windows 1809
+
+...