(Docker) Fix build hooks

[rootwyrm]

Build hooks are not currently working and I forgot how I got them working. Need to fix them.

[rootwyrm]

pre_build confirmed as fixed by rootwyrm/tc_docker@8d57217

However, this would require making the change to every Docker build individually which violates the centralization principle.

Preliminary thought;

pre_build:
#!/bin/bash

curl https://$TALECASTER_REPO/docker/hooks/pre_build | sh

build hook is still depressingly inadequate though. I'm not going to be happy with that till it properly tags version. I also need to clean up the variables to be more obvious to myself. Wasted a good 5 minutes having to reference back and forth, and that's no good at all.

[rootwyrm]

Bringing in hooks from dns_docker has solved for many, but still have a Docker Hub cleanup issue that rears it's head with multi-platform in the workflow.