update dockerfile, see #35

dev.Dockerfile

@@ -1,10 +1,17 @@
-FROM tiangolo/uvicorn-gunicorn:python3.8-alpine3.10
+FROM tiangolo/uvicorn-gunicorn-fastapi:python3.8-slim
 LABEL authors="Michal Stolarczyk"
 
 COPY . /app
-RUN apk add --no-cache --virtual .build-deps build-base alpine-sdk postgresql-dev gcc python3-dev musl-dev bash git openssh
+# For alpine:
+#RUN apk add --no-cache --virtual .build-deps build-base alpine-sdk postgresql-dev gcc python3-dev musl-dev bash git openssh
+
+# For slim:
+RUN apt-get update 
+RUN apt-get install -y git
+RUN apt-get install -y libpq-dev
+RUN apt-get install -y gcc
 
 RUN pip install -r requirements/requirements-dev.txt
 RUN pip install -r requirements/requirements-all.txt
 RUN git clone https://github.com/vishnubob/wait-for-it.git
-RUN pip install .
+RUN pip install .