Resumable `ollama push`

### What is the issue? When pushing models to ollama.com's registry, if they fail part way through - when you go to continue the push they start from scratch again. This is quite painful when you've spent hours trying to upload from ~~Australian~~ a slow internet link as it can mean many hours of uploading and hoping for the best. <img width="1678" alt="SCR-20240321-gzoz" src="https://github.com/ollama/ollama/assets/862951/f3dec809-4445-428e-8b70-3d4f7b9eb1da"> <img width="1675" alt="SCR-20240321-gzvk" src="https://github.com/ollama/ollama/assets/862951/d8d1e4ee-358d-4dd8-815c-c5b9bfc24dd6"> ### What did you expect to see? Errors happen, things fail - but they should be resumable (at least for say 24hrs). I expected to run the push and have it pickup where it left off (around 8%). ### Steps to reproduce - Come to Australia, enjoy our fine internet infrastructure. - Push a large model to ollama.com - Take pleasure in the chance game which is Australian internet reliability. - When your upload fails, try to continue the upload by pushing again. - Tears. ### Are there any recent changes that introduced the issue? _No response_ ### OS Linux, macOS ### Architecture arm64, amd64 ### Platform _No response_ ### Ollama version 0.1.29 ### GPU Nvidia, Apple ### GPU info N/A ### CPU AMD, Apple ### Other software _No response_