use current branch name when building image #144

Job	Run time
test-make_build	1m 29s
define-env	7s
test-make_test	1m 57s
build-container	5m 35s
test-container-localflare-offline	1m 1s
test-container-localflare-online (true)	1m 17s
test-container-localflare-online (false)	1m 8s
	12m 34s

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