- Update node version for Dockerfiles (#371)

- Add .editorconfig settings

.editorconfig

+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+root = true
+
+[*]
+
+# Change these settings to your own preference
+indent_style = space
+indent_size = 2
+
+# We recommend you to keep these unchanged
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.py]
+indent_size = 4
+
+[*.json]
+indent_size = 2
+
+[*.yaml]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab

local.Dockerfile

 ARG METADATASERVICE_BASE
 ARG SEARCHSERVICE_BASE
 
-FROM node:8-slim as node-stage
+FROM node:12-slim as node-stage
 WORKDIR /app/amundsen_application/static
 
 COPY amundsen_application/static/package.json /app/amundsen_application/static/package.json

public.Dockerfile

-FROM node:8-slim as node-stage
+FROM node:12-slim as node-stage
 WORKDIR /app/amundsen_application/static
 
 COPY amundsen_application/static/package.json /app/amundsen_application/static/package.json