revert to python:3.7-slim base image since ubuntu:20.04 is clearly not working for arm

Dockerfile

@@ -19,15 +19,15 @@ RUN npm install
 COPY src-ui .
 RUN node_modules/.bin/ng build --prod --output-hashing none --sourceMap=false
 
-FROM ubuntu:20.04
+FROM python:3.7-slim
 
 WORKDIR /usr/src/paperless/
 
-COPY Pipfile* ./
+COPY requirements.txt ./
 
 #Dependencies
 RUN apt-get update \
-  && DEBIAN_FRONTEND="noninteractive" apt-get -y --no-install-recommends install \
+  && apt-get -y --no-install-recommends install \
 		build-essential \
 		curl \
 		file \
@@ -38,21 +38,16 @@ RUN apt-get update \
 		icc-profiles-free \
 		imagemagick \
 		libatlas-base-dev \
-		libffi-dev \
 		liblept5 \
 		libmagic-dev \
 		libpoppler-cpp-dev \
 		libpq-dev \
 		libqpdf-dev \
-		libssl-dev \
 		libxml2 \
 		libxslt1-dev \
 		mime-support \
 		optipng \
 		pngquant \
-		python3 \
-		python3-pip \
-		python3-dev \
 		qpdf \
 		sudo \
 		tesseract-ocr \
@@ -64,13 +59,9 @@ RUN apt-get update \
 		tzdata \
 		unpaper \
 		zlib1g \
-
+	&& pip3 install --upgrade supervisor \
-  && pip3 install --upgrade supervisor pipenv setuptools \
+  && python3 -m pip install -r requirements.txt \
-  && pipenv lock -r > requirements.txt \
+	&& apt-get -y purge build-essential libqpdf-dev \
-  && pip3 install -r requirements.txt \
-  && pipenv --clear \
-  && pip3 uninstall -y pipenv \
-	&& apt-get -y purge build-essential libqpdf-dev python3-dev python3-pip \
 	&& apt-get -y autoremove --purge \
 	&& rm -rf /var/lib/apt/lists/* \
 	&& mkdir /var/log/supervisord /var/run/supervisord

requirements.txt

@@ -0,0 +1,74 @@
+#
+# These requirements were autogenerated by pipenv
+# To regenerate from the project's Pipfile, run:
+#
+#    pipenv lock --requirements
+#
+
+-i https://pypi.python.org/simple
+--extra-index-url https://www.piwheels.org/simple
+arrow==0.17.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
+asgiref==3.3.1; python_version >= '3.5'
+blessed==1.17.12
+certifi==2020.12.5
+cffi==1.14.4
+chardet==4.0.0; python_version >= '3.1'
+coloredlogs==15.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
+cryptography==3.3.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4, 3.5'
+dateparser==0.7.6
+django-cors-headers==3.6.0
+django-extensions==3.1.0
+django-filter==2.4.0
+django-picklefield==3.0.1; python_version >= '3'
+django-q==1.3.4
+django==3.1.5
+djangorestframework==3.12.2
+filelock==3.0.12
+fuzzywuzzy==0.18.0
+gunicorn==20.0.4
+humanfriendly==9.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
+idna==2.10; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+imap-tools==0.34.0
+img2pdf==0.4.0
+importlib-metadata==3.3.0; python_version < '3.8'
+inotify-simple==1.3.5; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+inotifyrecursive==0.3.5
+joblib==1.0.0; python_version >= '3.6'
+langdetect==1.0.8
+lxml==4.6.2; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
+numpy==1.19.5; python_version >= '3.6'
+ocrmypdf==11.4.5
+pathvalidate==2.3.2
+pdfminer.six==20201018; python_version >= '3.4'
+pdftotext==2.1.5
+pikepdf==2.2.5
+pillow==8.1.0
+pluggy==0.13.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+psycopg2-binary==2.8.6
+pycparser==2.20; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+python-dateutil==2.8.1
+python-dotenv==0.15.0
+python-gnupg==0.4.6
+python-levenshtein==0.12.0
+python-magic==0.4.18
+pytz==2020.5
+redis==3.5.3
+regex==2020.11.13
+reportlab==3.5.59
+requests==2.25.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
+scikit-learn==0.23.2
+scipy==1.5.4; python_version >= '3.6'
+six==1.15.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+sortedcontainers==2.3.0
+sqlparse==0.4.1; python_version >= '3.5'
+threadpoolctl==2.1.0; python_version >= '3.5'
+tika==1.24
+tqdm==4.55.1
+typing-extensions==3.7.4.3; python_version < '3.8'
+tzlocal==2.1
+urllib3==1.26.2; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'
+watchdog==1.0.2
+wcwidth==0.2.5
+whitenoise==5.2.0
+whoosh==2.7.4
+zipp==3.4.0; python_version >= '3.6'