a unified docker image

Dockerfile

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+# syntax=docker/dockerfile:1
+FROM node:12-alpine AS frontend-build
+WORKDIR /app
+COPY frontend/package.json frontend/yarn.lock ./
+RUN yarn
+COPY frontend/webpack* frontend/tsconfig.json ./
+COPY frontend/assets assets
+COPY frontend/src src
+COPY frontend/theme theme
+RUN yarn run build
+RUN yarn run build:server
+
+FROM node:12-alpine AS frontend
+WORKDIR /app
+COPY --from=frontend-build /app/build build
+COPY --from=frontend-build /app/build-server build-server
+COPY frontend/package.json .
+
+CMD ["npm", "start"]
+
+# ----
+
+FROM python:3.7-alpine AS build-backend
+ARG EXTRA_DEPS
+
+RUN apk add build-base musl-dev libffi-dev openssl-dev mariadb-dev
+
+WORKDIR /app
+RUN pip install -U setuptools 'cryptography>=3.0,<3.1' poetry==1.1.7
+COPY backend/pyproject.toml backend/poetry.lock ./
+RUN poetry config virtualenvs.path /venv
+RUN poetry install --no-dev --no-ansi --no-interaction
+RUN poetry run pip install -U setuptools $EXTRA_DEPS
+
+COPY backend/manage.py backend/gunicorn.conf.py ./
+COPY backend/tabby tabby
+COPY --from=frontend /app/build /frontend
+
+ARG BUNDLED_TABBY=1.0.163
+
+RUN FRONTEND_BUILD_DIR=/frontend /venv/*/bin/python ./manage.py collectstatic --noinput
+RUN FRONTEND_BUILD_DIR=/frontend /venv/*/bin/python ./manage.py add_version ${BUNDLED_TABBY}
+
+FROM python:3.7-alpine AS backend
+
+ADD https://github.com/ufoscout/docker-compose-wait/releases/download/2.9.0/wait /wait
+RUN chmod +x /wait
+
+RUN apk add mariadb-connector-c
+
+COPY --from=build-backend /app /app
+COPY --from=build-backend /venv /venv
+
+COPY backend/start.sh backend/manage.sh /
+RUN chmod +x /start.sh /manage.sh
+CMD ["/start.sh"]