Build git-annex on Ubuntu #1281

Job	Run time
build-package	12m 47s
test-datalad (master)	1h 17m 41s
test-annex (normal, ubuntu-latest)	3m 27s
test-annex (crippled-tmp, ubuntu-latest)	3m 56s
test-annex-more	11s
test-datalad (maint)	1h 3m 51s
test-datalad (release)	1h 3m 28s
test-annex (crippled-home, ubuntu-latest)	3m 5s
test-annex (nfs-home, ubuntu-latest)	11m 29s
test-annex (custom-config1, ubuntu-latest)	3m 31s
	4h 3m 26s

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