gitolite: Make admin pubkey an optional input to Docker image

Automating the build of this image will be awkward if we need a
user-supplied input file each time.  At best, it will probably lead to
building out of per-instance configuration branches that store the
file...

The initial administrator pubkey is only really needed to include in the
first image that is run at any given site, since a new install doesn't
have a config/repository datastore yet.  Once that is the case, the
procedure in the Dockerfile to init the /var/lib/gitolite directory (now
refactored to a shell script file) can be skipped, since that directory
will be replaced by the previous container's volume.

This is probably not the final form of this kind of build design change,
but will work for now to get up and running easily with cychedelic.

Signed-off-by: Malfurious <m@lfurio.us>

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