Improved dockerfile

Author: Taaku18

.dockerignore

@@ -140,17 +140,11 @@ test.py
 # Other stuff
 .env.example
 .gitignore
-.lint.py
-.pylintrc
-.travis.yml
+.github/
 app.json
 CHANGELOG.md
-CODE_OF_CONDUCT.md
-CONTRIBUTING.md
-requirements.min.txt
 Procfile
 pyproject.toml
 README.md
-runtime.txt
-SPONSORS.json
-stack.yml
+Pipfile
+Pipfile.lock

Dockerfile

@@ -1,11 +1,16 @@
-FROM python:3.7-alpine
+FROM python:3.9-slim as py
+
+FROM py as build
+
+RUN apt update && apt install -y g++
+COPY requirements.min.txt /
+RUN pip install --prefix=/inst -U -r /requirements.min.txt
+
+FROM py
+
 ENV USING_DOCKER yes
+COPY --from=build /inst /usr/local
+
 WORKDIR /modmailbot
+CMD ["python", "bot.py"]
 COPY . /modmailbot
-RUN  export PIP_NO_CACHE_DIR=false \
-    && apk update \
-    && apk add --update --no-cache --virtual .build-deps alpine-sdk \
-    && pip install pipenv \
-    && pipenv install --deploy --ignore-pipfile \
-    && apk del .build-deps
-CMD ["pipenv", "run", "bot"]