environment variable AUTOVACUUM added

The postgressql autovacuum feature is by default active. The environment variable AUTOVACUUM allows you to switch off this feature during start of docker container.

postgresql.custom.conf.tmpl

@@ -0,0 +1,24 @@
+# Suggested minimal settings from
+# https://ircama.github.io/osm-carto-tutorials/tile-server-ubuntu/
+
+shared_buffers = 128MB
+min_wal_size = 1GB
+max_wal_size = 2GB
+work_mem = 32MB
+maintenance_work_mem = 256MB
+
+# Suggested settings from
+# https://github.com/openstreetmap/chef/blob/master/roles/tile.rb#L38-L45
+
+max_connections = 250
+temp_buffers = 32MB
+work_mem = 128MB
+wal_buffers = 1024kB
+wal_writer_delay = 500ms
+commit_delay = 10000
+# checkpoint_segments = 60 # unrecognized in psql 10.7.1
+max_wal_size = 2880MB
+random_page_cost = 1.1
+track_activity_query_size = 16384
+autovacuum_vacuum_scale_factor = 0.05
+autovacuum_analyze_scale_factor = 0.02