Ensures node requirements are installed independently of AUTO_UPDATE

[dougbtv]

Only runs git pull when AUTO_UPDATE is set, otherwise, installs all requirements.

(Still WIP, working on testing the fix)

Fixes #68

[dougbtv]

I think my main concern is that this is kind of noisy output in cases when most are already installed? Maybe there's a more elegant way to check if any need update install before output? Feedback welcome of course.

[dougbtv]

(umm, including the lines below too, that suffers the same ills I'd wager)

[dougbtv]

Figured out I can test by setting PROVISIONING_SCRIPT to https://raw.githubusercontent.com/dougbtv/comfyui/provisioning-node-requirements/config/provisioning/default.sh

(and by editing the NODES array at the top of the file with the custom nodes in question in my situation...)

[dougbtv]

"works on my (cloudified) machine" with PROVSIONING_SCRIPT set to:

https://raw.githubusercontent.com/dougbtv/comfyui/provisioning-node-requirements-tester/config/provisioning/default.sh

Which includes this diff plus a couple items in the NODES array that I had installed with manager.

...It's got me thinking if it needs changes to scan for the installed nodes? unsure.