Add endpoint to automate PR create for new images

[DennisPeriquet]

https://issues.redhat.com/browse/ART-10508

This PR adds a /git_jira_api endpoint to the ART ui server backend so that we can call it from the ART UI frontend to create a PR and Jira automatically.

I chose to implement this in the backend because trying to create a PR via the git api from the front end would result in a CORS (Cross Origin Resource Sharing) problem. Our Django settings allow CORS so creating a PR via the backend is fine.

If this is merged, it will lay dormant until something like this PR calls it.

Other:

• I created a Makefile to help setup a development environment (including debugging in vscode in the container using ssh), and run builds, but I'm still working on smoothing out the workflow.

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[DennisPeriquet]

/hold

[DennisPeriquet]

/hold cancel