374-update-images Update to BuildKit images 3.1. (#376)

sample.env

@@ -1,6 +1,6 @@
 # Environment variables defined in this file apply to both the Makefile and to
 # docker-compose.yml
-# 
+#
 # Due to restrictions in the `env-file` format we cannot specify multi-line
 # values for environment variables. For this reason the environment
 # variables are set on service definitions in the docker-compose.*.yml files,
@@ -38,7 +38,7 @@ PROJECT_DRUPAL_DOCKERFILE=Dockerfile
 CUSTOM_IMAGE_NAMESPACE=mynamespace
 
 # Image name of custom drupal image
-# This is used when pulling a custom image for environments set to custom and 
+# This is used when pulling a custom image for environments set to custom and
 # when building a custom image with make build
 CUSTOM_IMAGE_NAME=${COMPOSE_PROJECT_NAME}_drupal
 
@@ -87,14 +87,14 @@ DRUPAL_DATABASE_SERVICE=mariadb
 FCREPO_DATABASE_SERVICE=mariadb
 
 # Repository to use for pulling isle-buildkit images, change to `local`
-# To use images you have built locally with isle-buildkit, or use your 
+# To use images you have built locally with isle-buildkit, or use your
 # custom docker registry if you have set up one.
 #
 REPOSITORY=islandora
 
 # The version of the isle-buildkit images, non isle-buildkit images have
 # their versions specified explicitly in their respective docker-compose files.
-TAG=3.0.0
+TAG=3.1.3
 
 ###############################################################################
 # Exposed Containers & Ports