add source code and readme

build/piefed/piefed-worker/supervisord-worker.conf

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+[supervisord]
+nodaemon=true
+user=root
+logfile=/dev/stdout
+logfile_maxbytes=0
+pidfile=/var/run/supervisord.pid
+silent=false
+
+[program:celery-worker]
+command=celery -A celery_worker_docker.celery worker --autoscale=5,1 --queues=celery,background,send --loglevel=info --task-events
+user=piefed
+directory=/app
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+autorestart=true
+priority=100
+startsecs=10
+stopasgroup=true
+killasgroup=true
+environment=FLASK_APP="pyfedi.py",CELERY_HIJACK_ROOT_LOGGER="false",CELERY_SEND_TASK_EVENTS="true",CELERY_TASK_TRACK_STARTED="true"
+
+# Note: PieFed appears to use cron jobs instead of celery beat for scheduling
+# The cron jobs are handled via Kubernetes CronJob resources
+
+[group:piefed-worker]
+programs=celery-worker
+priority=999