Use git build

[deviantintegral]

Summary

While I expect by now caches have cleared, this will fully prevent the issue I mentioned at #144 (comment) from happening.

Alternatives Considered

I actually tried query busters and other usual tricks and they didn't work. This seems simplest and repeatable.

Testing Steps

1. Let this build!
2. Fetch and confirm that the md5 of the script is 15e12918b95e45e82de71273094b1a9f.

[deviantintegral]

🤦 in my testing I was pulling ghcr.io/pbkhrv/rtl_433-hass-addons-rtl_433_mqtt_autodiscovery-aarch64:next not ghcr.io/pbkhrv/rtl_433-hass-addons-rtl_433_mqtt_autodiscovery-next-aarch64:next. This is working as expected.