Make CI clone repos instead of fetching them

Most of our web repos use lego as a submodule. CI doesn't pull in
submodule updates when the git strategy is fetch. This leads to sites
drifting slightly in what version of lego they use. It can also cause
confusion and frustration when trying to fix a bug in lego that *should*
be fixed, but isn't fixed in the CI build.
1 job for !26 with git-strategy-clone in 27 seconds (queued for 1 second)
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