Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>

This closes HTTP responses when no content reads are required, as
when requests are made in streaming mode, ``requests`` doesn't know
whether the caller may intend to later read content from a streamed
HTTP response object and holds the socket open.

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>

- Add 'workflow_dispatch' target
- Force output to use colour
- Print traceback on error
- Use parallel building

This means that 'push' triggered workflows are not cancelled.