Genericized containerfile

Containerfile

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+FROM alpine:3.15
+# Python image includes two Python versions, so use base Alpine
+
+# Based on the work of Jonathan Boeckel <jonathanboeckel1996@gmail.com>
+
+WORKDIR /usr/src/app
+
+# Install run dependencies first
+RUN apk add --no-cache python3 tzdata
+
+# system pip could be removed after build, but apk then decides to also remove all its
+# python dependencies, even if they are explicitly installed as python packages
+# whut
+RUN \
+	apk add py3-pip && \
+	pip install wheel
+
+COPY ./requirements.txt ./requirements.txt
+
+RUN \
+	apk add --no-cache --virtual .build-deps gcc g++ python3-dev libxml2-dev libxslt-dev libffi-dev libc-dev py3-pip linux-headers && \
+	pip install --no-cache-dir -r requirements.txt && \
+	apk del .build-deps
+
+
+# no chance for caching below here
+
+COPY . .
+
+RUN pip install /usr/src/app
+
+# Docker-specific configuration and default to IPv4
+ENV MALOJA_SKIP_SETUP=yes
+ENV MALOJA_HOST=0.0.0.0
+
+EXPOSE 42010
+# use exec form for better signal handling https://docs.docker.com/engine/reference/builder/#entrypoint
+ENTRYPOINT ["maloja", "run"]