Add gitpod IDE support (#204)

- add gitpod IDE support
- add custom chrome launcher to karma configuration

.gitpod.yml

@@ -0,0 +1,26 @@
+# The Docker image to run your workspace in. Defaults to gitpod/workspace-full
+image:
+  file: docker/Dockerfile
+  # Context is optional, defaults to an empty context
+  context: docker
+
+# Command to start on workspace startup (optional)
+tasks:
+- command: "npm install"
+
+github:
+  prebuilds:
+    # enable for the master/default branch (defaults to true)
+    master: true
+    # enable for all branches in this repo (defaults to false)
+    branches: false
+    # enable for pull requests coming from this repo (defaults to true)
+    pullRequests: true
+    # enable for pull requests coming from forks (defaults to false)
+    pullRequestsFromForks: true
+    # add a "Review in Gitpod" button as a comment to pull requests (defaults to true)
+    addComment: false
+    # add a "Review in Gitpod" button to pull requests (defaults to false)
+    addBadge: true
+    # add a label once the prebuild is ready to pull requests (defaults to false)
+    addLabel: false

docker/Dockerfile

@@ -0,0 +1,53 @@
+FROM gitpod/workspace-full:latest
+
+USER root
+# Install chrome dependencies
+RUN apt-get update && apt-get install -y \
+  gconf-service \
+  libappindicator3-1 \
+  libasound2 \
+  libatk1.0-0 \
+  libatk-bridge2.0-0 \
+  libc6 \
+  libcairo2 \
+  libcups2 \
+  libdbus-1-3 \
+  libexpat1 \
+  libfontconfig1 \
+  libgcc1 \
+  libgconf-2-4 \
+  libgdk-pixbuf2.0-0 \
+  libglib2.0-0 \
+  libgtk-3-0 \
+  libnspr4 \
+  libpango-1.0-0 \
+  libpangocairo-1.0-0 \
+  libstdc++6 \
+  libx11-6 \
+  libx11-xcb1 \
+  libxcb1 \
+  libxcomposite1 \
+  libxcursor1 \
+  libxdamage1 \
+  libxext6 \
+  libxfixes3 \
+  libxi6 \
+  libxrandr2 \
+  libxrender1 \
+  libxss1 \
+  libxtst6 \
+  ca-certificates \
+  fonts-liberation \
+  libappindicator1 \
+  libnss3 \
+  lsb-release \
+  xdg-utils \
+  wget
+
+# Install chrome
+RUN curl https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb -o /chrome.deb
+RUN dpkg -i /chrome.deb || apt-get install -yf
+RUN rm /chrome.deb
+
+# Give back control
+USER root

karma.conf.js

@@ -25,7 +25,13 @@ module.exports = function (config) {
     colors: true,
     logLevel: config.LOG_INFO,
     autoWatch: true,
-    browsers: ['ChromeHeadless'],
+    browsers: ['ModifiedChromeHeadless'],
+    customLaunchers: {
+      ModifiedChromeHeadless: {
+        base: 'ChromeHeadless',
+        flags: ['--no-sandbox']
+      }
+    },
     singleRun: true
   });
 };