bugfixes for dokku deployment

Dockerfile

@@ -1,12 +1,23 @@
 FROM python:3.8-alpine
 
-# RUN apk add --no-cache something
-RUN pip install --upgrade pip
-RUN pip install gunicorn
+RUN apk add --no-cache gcc
+RUN apk add --no-cache python3-dev
+RUN apk add --no-cache libc-dev
+RUN apk add --no-cache libffi-dev
+RUN apk add --no-cache openssl
+RUN apk add --no-cache openssl-dev
+
+RUN adduser -D deploy
+USER deploy
+ENV PATH "$PATH:/home/deploy/.local/bin"
 
 COPY . /app
 WORKDIR /app
 
+RUN pip install --upgrade pip
+RUN pip install gunicorn
+RUN pip install wheel
+
 RUN pip install -r requirements.txt
 RUN flit install --pth-file
 

requirements.txt

@@ -40,8 +40,6 @@ passlib==1.7.2
 PasteDeploy==2.1.0
 pathspec==0.8.0
 peppercorn==0.6
-pip==20.2.3
-pkg-resources==0.0.0
 plaster==1.0
 plaster-pastedeploy==0.7
 pluggy==0.13.1
@@ -69,7 +67,6 @@ repoze.lru==0.7
 repoze.sendmail==4.4.1
 requests==2.24.0
 SecretStorage==3.1.2
-setuptools==44.0.0
 six==1.15.0
 soupsieve==2.0.1
 SQLAlchemy==1.3.19