Kohadev: use build arg and a more sensible name to Koha base image

docker-compose/dev.yml

@@ -9,6 +9,7 @@ services:
       context: "${KOHAPATH}/kohadev"
       dockerfile: Dockerfile
       args:
+        KOHA_BASE_IMAGE_TAG: "$KOHA_BASE_IMAGE_TAG"
         KOHA_RELEASE: "$KOHA_RELEASE"
     networks:
       - backend

docker-compose/docker-compose.env

 #export KOHA_RELEASE=17.11.04-06-11 # listhistory + deleteditems merge
 export KOHA_RELEASE=17.11.04-07-33 # DEPLOY listhistory + deleteditems + purresaker merge
-# KOHA_IMAGE_TAG is only used as basis for building koha_dev image
-export KOHA_IMAGE_TAG=844259af2eebd935b6b6fd6e14fd18dd5d0b9304
+# KOHA_BASE_IMAGE_TAG is only used as basis for building koha_dev image
+export KOHA_BASE_IMAGE_TAG=29dcaf95520f2fcbc721ae7563d910830e1d8dc0
 export GITREF=$(git rev-parse HEAD)

kohadev/Dockerfile

@@ -3,8 +3,8 @@
 # Based on debian jessy Koha
 # USES a docker image built from GITREF from koha-salt-docker
 #######
-
-FROM digibib/koha:c2735642135d7df4d5d14e01e6f9023055d294a0
+ARG KOHA_BASE_IMAGE_TAG
+FROM digibib/koha:${KOHA_BASE_IMAGE_TAG}
 
 MAINTAINER Oslo Public Library "digitalutvikling@gmail.com"