build: update Docker dev environment

Dockerfile

@@ -61,7 +61,7 @@ ONBUILD RUN \
 
 # Here we use the MATERIAL_METHOD arg to determine which method we use to get 
 # material into our container for build time.
-FROM ${MATERIAL_METHOD}_material as material
+FROM ${MATERIAL_METHOD}_material AS material
 
 #### 
 # BUILDER

docker-compose.dev.yml

@@ -28,8 +28,20 @@ services:
         YAML_TEMPLATE: "config/oxford.yaml"
     command: "yarn dev"
     volumes:
+      - node-modules:/app/node_modules
+      - ./.material:/app/.material
+      - ./config:/app/config
       - ./components:/app/components
+      - ./lib:/app/lib
       - ./pages:/app/pages
+      - ./public:/app/public
+      - ./scripts:/app/scripts
+      - ./styles:/app/styles
+      - ./.env:/app/.env
+      - ./next.config.js:/app/next.config.js
+      - ./cypress.config.ts:/app/cypress.config.ts
+      - ./postcss.config.js:/app/postcss.config.js
+      - ./tailwind.config.js:/app/tailwind.config.js
     ports:
       - "3000:3000"
     links: 
@@ -42,3 +54,4 @@ services:
       DATABASE_URL: postgresql://postgres:super-secret-password@db:5432
 volumes:
   dev-data:
+  node-modules:

docs/development/docker.md

@@ -40,3 +40,18 @@ value (under `services.gutenberg.build.args`) to a different config yaml file or
 changing `MATERIAL_METHOD` to `"copy"` to copy a locally checked out folder into
 the container at build-time instead of pulling fresh - for more details on how
 to pull material to edit locally follow the below section.
+
+## Local development with Docker
+
+`docker-compose.dev.yaml` configures a local development environment in Docker,
+including Node and Yarn. It runs the app in development mode, so that you can make
+changes to the code and see them on http://localhost:3000.
+
+```sh
+# build the development image
+docker compose -f docker-compose.dev.yaml build
+# run the Next.js app on http://localhost:3000 in development mode
+docker compose -f docker-compose.dev.yaml up
+# shut down the app and database when you're finished
+docker compose -f docker-compose.dev.yaml down
+```