Refactor containerfile to align with lsio python install

* Simplify project file copy
* Reduce system and project dependency installs into single layer
* Add default permission ENVs for backwards-compatibility

Containerfile

@@ -1,40 +1,59 @@
 FROM lsiobase/alpine:3.17 as base
-# 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 py3-lxml 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
-
-COPY container/root/ /
-
-
-# no chance for caching below here
-
 COPY --chown=abc:abc . .
 
-RUN pip install /usr/src/app
+# based on https://github.com/linuxserver/docker-pyload-ng/blob/main/Dockerfile
+# Everything is run in one command so we can purge all build dependencies and cache in the same layer after maloja is installed
+#
+# -- it may be possible to decrease image size slightly by using build stage and copying all site-packages to runtime stage
+# but the image is already pretty small (117mb uncompressed, ~40mb compressed)
+RUN \
+    echo "**** install build packages ****" && \
+	apk add --no-cache --virtual=build-deps \
+	gcc \
+	g++ \
+	python3-dev \
+	libxml2-dev \
+	libxslt-dev \
+	libffi-dev \
+	libc-dev \
+	py3-pip \
+	linux-headers && \
+	echo "**** install runtime packages ****" && \
+	apk add --no-cache \
+	python3 \
+	py3-lxml \
+	tzdata && \
+	echo "**** install pip dependencies ****" && \
+	python3 -m ensurepip && \
+    pip3 install -U --no-cache-dir \
+        pip \
+        wheel && \
+    echo "**** install maloja requirements ****" && \
+    pip3 install --no-cache-dir -r requirements.txt && \
+    echo "**** install maloja ****" && \
+    pip3 install /usr/src/app && \
+    echo "**** cleanup ****" && \
+    apk del --purge \
+        build-deps && \
+    rm -rf \
+        /tmp/* \
+        ${HOME}/.cache
+
+COPY container/root/ /
 
 # Docker-specific configuration
 # defaulting to IPv4 is no longer necessary (default host is dual stack)
 ENV MALOJA_SKIP_SETUP=yes
 ENV PYTHONUNBUFFERED=1
 
+# Prevents breaking change for previous container that ran maloja as root
+# which meant MALOJA_DATA_DIRECTORY was created by and owned by root (UID 0)
+#
+# On linux hosts (non-podman rootless) these variables should be set to the host user that should own the host folder bound to MALOJA_DATA_DIRECTORY
+ENV PUID=0
+ENV PGID=0
+
 EXPOSE 42010