smaller improvements to setup.sh (#153)

* replace bash function to list docker tags with https://github.com/genuinetools/reg/
  * this depends on new release in https://github.com/genuinetools/reg/issues/186 to fully function
* update docker version
* fix version.sh to also show versions from repos defined in .env
* add script to list available tags and update values in .env
* define default values for all version vars
* add previously missing containers
* use command instead of hash in update env script
* use a custom select function instead shell builtin (since it does not handle default values)
* add setup-update-tag in test.exp

Makefile

@@ -1,3 +1,5 @@
+SHELL := /bin/bash # Use bash syntax
+
 # if not run in travis, get docker_login and _pwd from file
 ifndef TRAVIS
 	docker_repo := zokradonh
@@ -174,6 +176,7 @@ tag-all: build-all ## Helper target to create tags for all images.
 
 tag-container: component ?= base
 tag-container: ## Helper target to tag a given image. Defaults to the base image.
+	# TODO how to tag additional releases. e.g. also tag 8.7.80.1035 as 8.7.80?
 	@echo 'create tag $($(component)_version)'
 	docker tag $(docker_repo)/kopano_$(component) $(docker_repo)/kopano_$(component):${$(component)_version}
 	@echo $(docker_repo)/kopano_$(component):${$(component)_version} >> $(TAG_FILE)