chore: use heroku docker images (#1476)

.circleci/config.yml

@@ -77,7 +77,7 @@ jobs:
   node10-test:
     <<: *test
     docker:
-      - image: chadian/nsis:10-2
+      - image: heroku/nsis:10-2
     resource_class: large
   release:
     <<: *defaults
@@ -134,7 +134,7 @@ jobs:
           ./scripts/release/change_management
   dev_center_docs:
     docker: &devdocs_docker
-      - image: chadian/devcenter
+      - image: heroku/devcenter
         environment:
           LANG: en_US.UTF-8
           LANGUAGE: en_US.UTF-8

Dockerfile.devcenter

@@ -0,0 +1,12 @@
+FROM circleci/ruby:2.4-node
+
+# Get less (devcenter needs it)
+USER  root
+RUN   sudo apt-get update && apt-get install -y curl less
+USER  circleci
+
+# Install devcenter
+RUN   gem install devcenter --no-document
+
+# Remove old gems
+RUN   gem cleanup