simplest single Dockerfile setup for local pg_cron

Dockerfile.pg_cron

FROM postgres:16-alpine

RUN apk update && apk add postgresql-pg_cron

RUN cp /usr/lib/postgresql16/pg_cron.so /usr/local/lib/postgresql/ 
RUN cp /usr/share/postgresql/extension/* /usr/local/share/postgresql/extension

RUN echo "echo \"shared_preload_libraries = 'pg_cron'\" >> /var/lib/postgresql/data/postgresql.conf" >> /docker-entrypoint-initdb.d/000_bash.sh
RUN echo "echo \"cron.database_name = 'feeder'\" >> /var/lib/postgresql/data/postgresql.conf" >> /docker-entrypoint-initdb.d/000_bash.sh
RUN echo "echo \"cron.timezone = 'CEST'\" >> /var/lib/postgresql/data/postgresql.conf" >> /docker-entrypoint-initdb.d/000_bash.sh
RUN chmod +x /docker-entrypoint-initdb.d/000_bash.sh