Add docker support for development environment

README.md

@@ -23,12 +23,24 @@ stored in
 
 To set up a local instance of [doc.silverstripe.org](https://github.com/silverstripe/doc.silverstripe.org):
 
-* Install [Gatsby CLI](https://gatsbyjs.com)
 * Clone this repository to an empty directory
 ```
    git clone https://github.com/silverstripe/doc.silverstripe.org path/to/ssdocs
 ```
 
+### Docker install
+
+No local NodeJS nor gatsby-cli is required for this option.
+
+ * Make sure docker and docker-compose are installed and docker daemon is running
+ * Simply use `./docker/run` to run gatsby commands
+     - `./docker/run build` would be equal to run `gatsby build` within a container
+     - `./docker/run develop -p 8000` would run `gatsby develop -p 8000` within a container.
+
+### Native install
+
+* Install [Gatsby CLI](https://gatsbyjs.com)
+
 ## Building
 
 To test a static build of the site, first create a production environment file.

docker/Dockerfile

@@ -0,0 +1,3 @@
+FROM node:12
+
+RUN yarn global add gatsby-cli

docker/docker-compose.yml

@@ -0,0 +1,15 @@
+version: '3.7'
+
+x-entrypoint: &entry
+  - /bin/bash
+  - /app/docker/entrypoint.sh
+
+services:
+  gatsby:
+    build:
+      context: .
+    working_dir: /app
+    network_mode: "host"
+    volumes:
+      - '..:/app'
+    entrypoint: *entry

docker/entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+cd /app;
+
+if [[ ! -d "/app/node_modules" ]] ; then
+    yarn;
+fi;
+
+gatsby $@

docker/run

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+cd $(dirname $0) && docker-compose run -u $(id -u) --rm gatsby $@