Add endpoint for uploading docker image

[evanyeyeye]

Description

• Added endpoint for uploading a docker image tar created using docker save.
• The maximum file upload size was increased from 250 MB to 10 GB, which may be a concern for assignment uploads.
• Updated tango client script to utilize the new endpoint.
• Corresponding Autolab PR.

Testing

• Used the updated clients/tango-cli.py to upload and build a new docker image.
• Verified that bad file submissions are error reported properly, and do not crash Tango.

[evanyeyeye]

This PR is updated and ready for review.

[damianhxy]

@coderabbit review

[cg2v]

At the very least, this operation should verify that it's using the localDocker backend, since it can only possibly work with that backend.

[coderabbitai[bot]]

Walkthrough

## Walkthrough The recent updates involve enhancing a system with Docker capabilities, including building Docker images and handling larger input files. A new `.gitignore` entry ensures temporary Docker files are excluded. The `tango-cli` script now supports a build command, and the server-side code has been updated to handle build requests and manage Docker operations. Additionally, the Python environment has been adjusted with package version changes, including a downgrade of the `requests` package and the addition of the `docker` package. ## Changes | File(s) | Summary | | --- | --- | | `.gitignore` | Excluded `dockerTmp/*` to prevent tracking temporary Docker files. | | `clients/.../tango-cli.py` | Added `--build` argument and `tango_build` function for Docker image building. | | `config.template.py` | Increased `MAX_INPUT_FILE_SIZE` from 250MB to 10GB. | | `requirements.txt` | Downgraded `requests` to 2.28.0 and added `docker` 5.0.3. | | `restful_tango/server.py` | Added `BuildHandler` class for handling Docker build requests. | | `restful_tango/tangoREST.py` (3 entries) | Imported `docker` module, added Docker-related status codes, and a new `build` method for image building. |

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