This commit adds full interactivity to pre-commits. Whenever you run pre-commit
and it detects that the image should be rebuild, an interactive question will
pop up instead of failing the build and asking to rebuild with REBUILD=yes
This is much nicer from the user perspective. You can choose whether to:
1) Rebuild the image (which will take some time)
2) Not rebuild the image (this will use the old image with hope it's OK)
3) Quit.
Answer to that question is carried across all images needed to rebuild.
There is the special "build" pre-commit hook that takes care about that.
Note that this interactive question cannot be asked if you run only
single pre-commit hook with Dockerfile because it can run multiple processes
and you can start building in parallel. This is not desired so instead we fail
such builds.
Jarek Potiuk