Run housekeeping job on schedule

[PromoFaux]

What does this PR aim to accomplish?:

Exactly the same as pi-hole/docker-base-images#113

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[yubiuser]

Change of indention here.. makes me wonder if we need a editorconfig file in this and the docker-base repo?

[PromoFaux]

Yeah, potentially - I just changed it to match the rest of the file.

vdcode was already complaining about 2 spaces instead of 4 (I use the indent rainbow extension)