Example of failing run:
```
toolsbeta.test@toolsbeta-sgebastion-05:~$ toolforge build cancel test-buildpacks-pipelinerun-2mj9x
I'm going to cancel 1 runs, continue? [y/N]: y
Traceback (most recent call last):
File "/usr/bin/toolforge", line 8, in <module>
sys.exit(main())
File "/usr/lib/python3/dist-packages/toolforge_cli/cli.py", line 645, in main
toolforge()
File "/usr/lib/python3/dist-packages/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/usr/lib/python3/dist-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/usr/lib/python3/dist-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/lib/python3/dist-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/lib/python3/dist-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/lib/python3/dist-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/usr/lib/python3/dist-packages/toolforge_cli/cli.py", line 342, in wrapper
return func(*args, **kwargs)
File "/usr/lib/python3/dist-packages/toolforge_cli/cli.py", line 540, in build_cancel
json_patches=[{"op": "add", "path": "/spec/status", "value": "PipelineRunCancelled"}],
File "/usr/lib/python3/dist-packages/toolforge_cli/k8sclient.py", line 217, in patch_object
headers={"Content-type": "application/json-patch+json"},
File "/usr/lib/python3/dist-packages/toolforge_cli/k8sclient.py", line 142, in _patch
response.raise_for_status()
File "/usr/lib/python3/dist-packages/requests/models.py", line 940, in raise_for_status
raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: https://k8s.toolsbeta.eqiad1.wikimedia.cloud:6443/apis/tekton.dev/v1beta1/namespaces/image-build/pipelineruns/test-buildpacks-pipelinerun-2mj9x
```