add pg-cron back with the image (#284)

Dockerfile

@@ -36,7 +36,7 @@ RUN set -eux \
         netcat postgresql-${POSTGRES_MAJOR_VERSION}-ogr-fdw \
         postgresql-${POSTGRES_MAJOR_VERSION}-postgis-${POSTGIS_MAJOR}-scripts \
         postgresql-plpython3-${POSTGRES_MAJOR_VERSION} postgresql-${POSTGRES_MAJOR_VERSION}-pgrouting \
-        postgresql-server-dev-${POSTGRES_MAJOR_VERSION}
+        postgresql-server-dev-${POSTGRES_MAJOR_VERSION} postgresql-${POSTGRES_MAJOR_VERSION}-cron
 
 
 RUN echo $POSTGRES_MAJOR_VERSION >/tmp/pg_version.txt

scripts/env-data.sh

@@ -249,7 +249,7 @@ if [ -z "$EXTRA_CONF" ]; then
 fi
 
 if [ -z "${SHARED_PRELOAD_LIBRARIES}" ]; then
-    SHARED_PRELOAD_LIBRARIES=''
+    SHARED_PRELOAD_LIBRARIES='pg_cron'
 fi
 
 if [ -z "$PASSWORD_AUTHENTICATION" ]; then

scripts/setup-conf.sh

@@ -36,6 +36,7 @@ shared_preload_libraries = '${SHARED_PRELOAD_LIBRARIES}'
 cron.database_name = '${SINGLE_DB}'
 password_encryption= '${PASSWORD_AUTHENTICATION}'
 timezone='${TIMEZONE}'
+cron.use_background_workers = on
 EOF
 
 # This script will setup necessary replication settings

scripts/setup-database.sh

@@ -79,6 +79,11 @@ for db in $(echo ${POSTGRES_DBNAME} | tr ',' ' '); do
         fi
 done
 
+CRON_LOCKFILE="${ROOT_CONF}/.cron_ext.lock"
+if [ ! -f "${CRON_LOCKFILE}" ]; then
+	su - postgres -c "psql -c 'CREATE EXTENSION IF NOT EXISTS pg_cron cascade;' ${SINGLE_DB}"
+	touch ${CRON_LOCKFILE}
+fi
 
 # This should show up in docker logs afterwards
 su - postgres -c "psql -l 2>&1"