Fix: Fix testing `openvpn` in Dockerfile #175

Job	Run time
build-2-4-11	42s
build-2-4-4	36s
build-2-3-18	36s
build-2-4-12	3m 13s
build-2-4-6	38s
build-2-6-5	43s
build-2-5-8	41s
test-nogitdiff	17s
publish-draft-release	0s
update-dockerhub-description	0s
update-draft-release	0s
	7m 26s

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