upgraded postgres image

postgresql/Dockerfile

@@ -1,4 +1,4 @@
-FROM robinthoni/postgres-backup-multiarch:9.6
+FROM robinthoni/postgres-backup-multiarch:9.6-1.1.0
 
 RUN rm -rf /var/log/*
 

postgresql/docker-entrypoint-initdb.d/README.md

@@ -0,0 +1,6 @@
+The files in this folder will be copied in the postgres container and will be executed only on the first run.
+
+They MUST be named as `version_number_humanReadbleName.[sql|sql.gz|sh]` where:
+- version is `x.y.z`. Files are executed in versions order: 0.1.0 < 0.10.0 < 0.10.1 < 1.0.0
+- number is a number. Files are executed in their ASCII order, which means `0.1.0_1_my_first_files.sql` will be executed after `0.1.0_10_my_second_file.sh`. Use leading zeros to fix it, eg: `0.0.1_01_my_first_file.sql`
+- humanReadableName is pretty much what you want to describe this file