Change Dockerfiles and docker-compose file

The reason for this change is to reduce the image size for the different containers

backend/.dockerignore

@@ -0,0 +1 @@
+venv

backend/Dockerfile

@@ -1,11 +1,19 @@
-FROM python
+FROM python:slim as base
 
+FROM base as builder
+
+RUN mkdir /install
+WORKDIR /install
+
+COPY requirements.txt /requirements.txt
+
+RUN pip install --prefix=/install -r /requirements.txt
+
+FROM base
+
+COPY --from=builder /install /usr/local
+
+COPY /src /app
 WORKDIR /app
 
-COPY requirements.txt .
-
-RUN pip install -r requirements.txt
-
-COPY /src .
-
 CMD [ "flask", "run" ]

backend/Dockerfile.prod

@@ -1,15 +1,19 @@
-FROM python
-
-WORKDIR /app
+FROM python:slim as base
 
 RUN apt-get -y update && apt-get -y upgrade
 
-COPY requirements.txt .
+FROM base as builder
+RUN mkdir /install
+WORKDIR /install
 
-RUN apt-get -y install sqlite3
+COPY requirements.txt /requirements.txt
+RUN pip install --prefix=/install -r /requirements.txt
 
-RUN pip install -r requirements.txt
+FROM base
 
-COPY /src .
+COPY --from=builder /install /usr/local
 
-CMD [ "python", "app.py" ]
+COPY /src /app
+WORKDIR /app
+
+CMD [ "flask", "run" ]