In gce-runner.sh, include .git when copying SD repo
In gce-runner.sh, include .git when copying SD repo

It prevents the attempt in app-test/defaults/main.yml to locate the SD
root using "git rev-parse --show-toplevel".

ehartsuyker/securedrop,conorsch/securedrop,heartsucker/securedrop,heartsucker/securedrop,conorsch/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,heartsucker/securedrop,conorsch/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,ehartsuyker/securedrop,conorsch/securedrop