Can kaboom with non-informative JSONDecodeError

[yarikoptic]

• If failed to get credential - inform on what input, and use stdout if no stderr #221
• docker-credential-secretservice assumes needing to query by hostname not URL #222

❯ uv run try_oras.py
Traceback (most recent call last):
  File "/home/yoh/proj/datalad/trash/.venv/lib/python3.11/site-packages/requests/models.py", line 976, in json
    return complexjson.loads(self.text, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/yoh/.local/share/uv/python/cpython-3.11.12-linux-x86_64-gnu/lib/python3.11/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/yoh/.local/share/uv/python/cpython-3.11.12-linux-x86_64-gnu/lib/python3.11/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/yoh/.local/share/uv/python/cpython-3.11.12-linux-x86_64-gnu/lib/python3.11/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/yoh/proj/datalad/trash/try_oras.py", line 6, in <module>
    client.get_manifest(container)
  File "/home/yoh/proj/misc/oras-py/oras/decorator.py", line 26, in wrapper
    return func(cls, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/yoh/proj/misc/oras-py/oras/provider.py", line 961, in get_manifest
    manifest = response.json()
               ^^^^^^^^^^^^^^^
  File "/home/yoh/proj/datalad/trash/.venv/lib/python3.11/site-packages/requests/models.py", line 980, in json
    raise RequestsJSONDecodeError(e.msg, e.doc, e.pos)
requests.exceptions.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

on a trivial script

import oras.client
from oras.container import Container

client = oras.client.OrasClient()
container = Container("neurodebian:sid")
client.get_manifest(container)

since receiving HTML

957  	        get_manifest = f"{self.prefix}://{container.manifest_url()}"  # type: ignore
958  	        response = self.do_request(get_manifest, "GET", headers=headers)
959  	
960  	        self._check_200_response(response)
961  ->	        manifest = response.json()
962  	        jsonschema.validate(manifest, schema=oras.schemas.manifest)
963  	        return manifest
964  	
965  	    @decorator.retry()
966  	    def do_request(
(Pdb) p get_manifest
'https://docker.io/v2/neurodebian/manifests/sid'
(Pdb) p headers
{'Accept': 'application/vnd.oci.image.manifest.v1+json'}
(Pdb) p response.text[:10]
'<!DOCTYPE '

but is such a url legit/desired for manifest??