Fix: set_pihole_exec to match full container names #390
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When the LOCAL_DOCKER_CONTAINER and/or REMOTE_DOCKER_CONTAINER variable values, are substrings of other
container names, the set_pihole_exec function can fail, as it choses an incorrect container to exec as if it were the pihole
container.
This PR fixes this by adding beginning and ending pattern anchors to the 'docker ps -qf name=PATTERN' commands in
the gravity-sync script's set_pihole_exec function.