Add CI.

.gitlab-ci.yml

+stages:
+- release
+
+release:
+  stage: release
+  image: mhart/alpine-node
+  script:
+  - npm install
+  - $(npm bin)/vsce package
+  artifacts:
+    paths:
+    - "*.vsix"
+  tags:
+  - docker

package.json

@@ -54,6 +54,7 @@
 		"postinstall": "node ./node_modules/vscode/bin/install"
 	},
 	"devDependencies": {
+		"vsce": "^1.28.0",
 		"typescript": "^2.0.3",
 		"vscode": "^1.0.0",
 		"@types/node": "*"