Support running the Electron app in Gitpod for faster code reviews

.gitpod.yml

@@ -2,8 +2,12 @@ image:
   file: Dockerfile
 
 ports:
-- port: 3000
-  onOpen: open-browser
+  - port: 3000
+    onOpen: open-preview
+  - port: 5900
+    onOpen: ignore
+  - port: 6080
+    onOpen: ignore
 
 tasks:
   - init: >

Dockerfile

@@ -1,4 +1,4 @@
-FROM gitpod/workspace-full
+FROM gitpod/workspace-full-vnc
 
 USER root
 RUN apt-get update -q --fix-missing && \
@@ -7,7 +7,8 @@ RUN apt-get update -q --fix-missing && \
     build-essential \
     libssl-dev \
     golang-go \
-    libxkbfile-dev
+    libxkbfile-dev \
+    libnss3-dev
 
 RUN set -ex && \
     tmpdir=$(mktemp -d) && \