Use debian deps in Dockerfile

Dockerfile

@@ -1,19 +1,22 @@
-FROM debian:buster
+FROM debian:buster-backports
 
 # Force the stdout and stderr streams to be unbuffered
 ENV PYTHONUNBUFFERED 1
 
-# Install APT requirements
+# Install Django, external apps, LaTeX and dependencies
+# Outside Docker, you may also need git, acl, python3-venv, uwsgi, uwsgi-plugin-python3, nginx
 RUN apt-get update && \
-    apt-get install -y nginx python3 python3-pip python3-dev \
-    uwsgi uwsgi-plugin-python3 python3-venv git acl gettext \
-    libjs-bootstrap4 fonts-font-awesome \
-    texlive-latex-extra texlive-fonts-extra texlive-lang-french && \
+    apt-get install -t buster-backports -y python3-django python3-django-crispy-forms \
+    python3-django-extensions python3-django-filters python3-django-polymorphic \
+    python3-djangorestframework python3-django-cas-server python3-psycopg2 python3-pil \
+    python3-babel python3-lockfile python3-pip \
+    texlive-latex-extra texlive-fonts-extra texlive-lang-french \
+    gettext libjs-bootstrap4 fonts-font-awesome && \
     rm -rf /var/lib/apt/lists/*
 
 # Instal PyPI requirements
-COPY requirements /code/requirements
-RUN pip install -r requirements/base.txt -r requirements/cas.txt -r requirements/production.txt --no-cache-dir
+COPY requirements.txt /code/
+RUN pip3 install -r /code/requirements.txt --no-cache-dir
 
 # Copy code
 WORKDIR /code

requirements.txt

@@ -0,0 +1,7 @@
+django-htcpcp-tea==0.3.1
+django-mailer==2.0.1
+django-phonenumber-field==4.0.0
+django-tables2==2.1.0
+django-rest-polymorphic==0.1.8
+django-bootstrap-datepicker-plus==3.0.5
+django-colorfield==0.3.2

requirements/base.txt

@@ -1,31 +0,0 @@
-beautifulsoup4==4.9.1
-certifi==2019.6.16
-chardet==3.0.4
-defusedxml==0.6.0
-Django~=2.2
-django-allauth==0.39.1
-django-crispy-forms==1.7.2
-django-extensions==2.1.9
-django-filter==2.2.0
-django-htcpcp-tea==0.3.1
-django-mailer==2.0.1
-django-phonenumber-field==4.0.0
-django-polymorphic==2.0.3
-django-tables2==2.1.0
-docutils==0.14
-idna==2.8
-lxml==4.5.2
-oauthlib==3.1.0
-phonenumbers==8.12.7
-Pillow==7.1.2
-python3-openid==3.1.0
-pytz==2019.1
-requests==2.22.0
-requests-oauthlib==1.2.0
-six==1.12.0
-sqlparse==0.3.0
-djangorestframework==3.9.0
-django-rest-polymorphic==0.1.8
-urllib3==1.25.3
-django-bootstrap-datepicker-plus==3.0.5
-django-colorfield==0.3.2

requirements/cas.txt

@@ -1 +0,0 @@
-django-cas-server==1.2.0

requirements/production.txt

@@ -1 +0,0 @@
-psycopg2-binary==2.8.4