Keep the dev Dockerfile as a separate file

Dockerfile.dev

@@ -0,0 +1,24 @@
+# Start with a lightweight python 3 image
+FROM python:3-alpine
+
+# Send python output in real-time without needing to be buffered
+ENV PYTHONUNBUFFERED=1
+# Don't write .pyc files when importing source modules
+ENV PYTHONDONTWRITEBYTECODE=1
+WORKDIR /code
+COPY requirements.txt /code
+
+# Install the packages needed to install psycopg2-binary: https://stackoverflow.com/a/47871121
+RUN \
+ apk add --no-cache postgresql-libs && \
+ apk add --no-cache --virtual .build-deps gcc musl-dev postgresql-dev && \
+ # Install all python dependencies
+ pip install -r requirements.txt --no-cache-dir && \
+ apk --purge del .build-deps
+
+COPY . /code
+WORKDIR /code/stockhelper
+# Initialize the SQLite databases
+RUN python manage.py migrate
+# Load the flashcards data
+RUN python manage.py loaddata cards.json

docker-compose.yml

@@ -1,8 +1,11 @@
+# Docker Compose for dev builds only
 version: "3.9"
 
 services:
  web:
- build: .
+ build:
+ context: .
+ dockerfile: Dockerfile.dev
  command: >
  sh -c "python manage.py migrate &&
  python manage.py loaddata cards.json &&