git_pull: sanitize git_pull add-on to avoid deleting /config, fix some nits

[reynico]

"The risk of complete loss is possible." is a real thing with git_pull! I wiped out my /config folder and found that I am not alone. I did a backup just before putting my hands on git_pull, so it was innocuous for my HA install.

I added some error handling using set e so the script would stop running if an error occurred (like a misconfiguration or a connectivity problem). I also found using ~ a bit misleading when trying to set $HOME; for example, git couldn't find the ssh key when using ~ as $HOME.

Also, I decided to pass the SSH deployment key base64 encoded; otherwise, parsing the single-line SSH key would be a lot of struggle.

Last, the repo is cloned to a fresh folder called /new_config before destroying the working /config one.

[home-assistant]

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[home-assistant]

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