Development docker image

- Uses multistage build
- Adds a docker compose file for dev

docker/docker-compose.dev.yml

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+version: "3.8"
+
+# Docker compose recipe for InvenTree development server
+# - Runs sqlite3 as the database backend
+# - Uses built-in django webserver
+
+# IMPORANT NOTE:
+# The InvenTree docker image does not clone source code from git.
+# Instead, you must specify *where* the source code is located,
+# (on your local machine).
+# The django server will auto-detect any code changes and reload the server.
+
+services:
+    # InvenTree web server services
+    # Uses gunicorn as the web server
+    inventree-server:
+        container_name: inventree-server
+        image: inventree/inventree:latest
+        entrypoint: ./start_dev_server.sh
+        ports:
+            - 8000
+        depends_on:
+            - inventree-db
+        volumes:
+            # Ensure you specify the location of the 'src' directory at the end of this file
+            - src:/home/inventree/src
+            - data:/home/inventree/data
+            - static:/home/inventree/static
+        environment:
+            # Configure a simple sqlite server for development
+            # Note: You can always change to a different database backend if required!
+            - INVENTREE_DB_ENGINE=sqlite
+            - INVENTREE_DB_NAME=inventree
+        restart: unless-stopped
+
+    # Background worker process handles long-running or periodic tasks
+    inventree-worker:
+        container_name: inventree-worker
+        image: inventree/inventree:latest
+        entrypoint: ./start_worker.sh
+        depends_on:
+            - inventree-db
+            - inventree-server
+        volumes:
+            # Ensure you specify the location of the 'src' directory at the end of this file
+            - data:/home/inventree/data
+            - static:/home/inventree/static
+        environment:
+            # Configure a simple sqlite server for development
+            # Note: You can always change to a different database backend if required!
+            - INVENTREE_DB_ENGINE=sqlite
+            - INVENTREE_DB_NAME=inventree
+        restart: unless-stopped
+
+volumes:
+    # NOTE: Change /path/to/src to a directory on your local machine, where the InvenTree source code is located
+    # This directory must conatin the file *manage.py*
+    # Persistent data, stored external to the container(s)
+    src:
+        driver: local
+        driver_opts:
+            type: none
+            o: bind
+            # This directory specified where InvenTree source code is stored "outside" the docker containers
+            # Note: This directory must conatin the file *manage.py*
+            device: /path/to/src
+    # Uploaded data / media files, shared between containers
+    data:
+    # Static files, shared between containers
+    static: