docker: add single-container support

docker/dev/django/Dockerfile

@@ -18,7 +18,7 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 COPY --from=python-build-stage /usr/src/app/wheels /wheels/
 
 RUN apt-get update && \
-    apt-get install --no-install-recommends -y gettext && \
+    apt-get install --no-install-recommends -y gettext supervisor && \
     rm -rf /var/lib/apt/lists/* && \
     pip install --upgrade pip && \
     pip install --no-cache-dir --no-index --find-links=/wheels/ /wheels/* && \
@@ -26,9 +26,15 @@ RUN apt-get update && \
 
 COPY ./docker/dev/django/start /start
 COPY ./docker/dev/procrastinate/start /start-procrastinate
+COPY ./docker/dev/supervisord/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+COPY ./docker/dev/supervisord/supervisord.conf /etc/supervisord.conf
+COPY ./docker/dev/supervisord/start /start-supervisor
+
 RUN sed -i 's/\r$//g' /start && \
     chmod +x /start && \
     sed -i 's/\r$//g' /start-procrastinate && \
-    chmod +x /start-procrastinate
+    chmod +x /start-procrastinate && \
+    sed -i 's/\r$//g' /start-supervisor && \
+    chmod +x /start-supervisor
 
 COPY ./app .

docker/dev/supervisord/start

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -o errexit
+set -o pipefail
+set -o nounset
+
+export TASK_WORKERS=${TASK_WORKERS:=1}
+
+exec supervisord -c /etc/supervisor/conf.d/supervisord.conf

docker/dev/supervisord/supervisord.conf

@@ -0,0 +1,39 @@
+[supervisord]
+nodaemon=true
+logfile=/dev/null
+logfile_maxbytes=0
+pidfile=/tmp/supervisord.pid
+user=root
+
+[supervisorctl]
+serverurl=unix:///run/supervisord.sock
+
+[rpcinterface:supervisor]
+supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
+
+[unix_http_server]
+file=/run/supervisord.sock
+chmod=0700
+
+[program:web]
+directory=/usr/src/app
+command=/bin/bash /start
+stdout_logfile=/dev/fd/1
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/fd/2
+stderr_logfile_maxbytes=0
+autorestart=true
+startretries=5
+
+[program:procrastinate]
+directory=/usr/src/app
+command=/bin/bash /start-procrastinate
+process_name=%(program_name)s_%(process_num)02d
+numprocs=%(ENV_TASK_WORKERS)s
+numprocs_start=1
+stdout_logfile=/dev/fd/1
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/fd/2
+stderr_logfile_maxbytes=0
+autorestart=true
+startretries=5