create `services/install-gitlab.sh` (fixes #2139)#2159

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JLKwong wants to merge 6 commits intomasterfrom 2139-services-gitlab

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Commits on Apr 3, 2021

create services gitlab (fixes #2139 )
JLKwong
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Commits on Apr 4, 2021

add services gitlab (fixes #2139 )
JLKwong
committed

Commits on Apr 5, 2021

Commits on Apr 7, 2021

update svg (fixes #2139 )
JLKwong
committed