chore(enos): Add scenario that uses docker containers for infrastructure (#3073)

Co-authored-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>

enos/modules/docker_postgres/postgresql.conf

@@ -0,0 +1,14 @@
+listen_addresses           = '*'
+max_connections            = 100
+work_mem                   = 50000kB
+shared_buffers             = 64MB
+log_destination            = 'stderr'
+deadlock_timeout           = 100
+log_min_messages           = info
+log_min_error_statement    = error
+log_error_verbosity        = verbose
+log_lock_waits             = true
+log_statement              = all
+log_duration               = on
+log_min_duration_statement = 0
+log_line_prefix            = '%m [%p] (%x) %i '