[CI] bash scripts integration tests fail at IPFS upload

[clangenb]

See run:

https://github.com/encointer/encointer-node/actions/runs/21245975165/job/61139198748?pr=407

Logs:

Run source ./init_env.sh && ./test_bootstrap_demo_community.sh unregister-and-upgrade-registration
Set environment variables:
  BASH_DIR: /home/runner/work/encointer-node/encointer-node/scripts/ci
  SCRIPT_DIR: /home/runner/work/encointer-node/encointer-node/scripts
  PROJ_ROOT: /home/runner/work/encointer-node/encointer-node
  Client Directory: /home/runner/work/encointer-node/encointer-node/client
  Cleint Binary: /home/runner/work/encointer-node/encointer-node/target/release/encointer-client-notee
  Node binary: /home/runner/work/encointer-node/encointer-node/target/release/encointer-node-notee
Bootstrapping demo community and running tests: unregister-and-upgrade-registration
Traceback (most recent call last):
Chain is-parchain: False
  File "/home/runner/work/encointer-node/encointer-node/client/bootstrap_demo_community.py", line 551, in <module>
🔌 connecting to remote chain:  ws://127.0.0.1
    main()
👬 Registered community with cid: sqm1v79dF6b
  File "/opt/hostedtoolcache/Python/3.10.16/x64/lib/python3.10/site-packages/click/core.py", line 1485, in __call__
Uploading assets to ipfs
    return self.main(*args, **kwargs)
  File "/opt/hostedtoolcache/Python/3.10.16/x64/lib/python3.10/site-packages/click/core.py", line 1406, in main
    rv = self.invoke(ctx)
  File "/opt/hostedtoolcache/Python/3.10.16/x64/lib/python3.10/site-packages/click/core.py", line 1269, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/opt/hostedtoolcache/Python/3.10.16/x64/lib/python3.10/site-packages/click/core.py", line 824, in invoke
    return callback(*args, **kwargs)
  File "/home/runner/work/encointer-node/encointer-node/client/bootstrap_demo_community.py", line 519, in main
    cid = create_community(client, spec_file, ipfs_local, signer, wrap_call=wrap_call, batch_size=batch_size)
  File "/home/runner/work/encointer-node/encointer-node/client/bootstrap_demo_community.py", line 80, in create_community
    ipfs_cid = Ipfs.add_recursive(root_dir, ipfs_local)
  File "/home/runner/work/encointer-node/encointer-node/client/py_client/ipfs.py", line 62, in add_recursive
    data = json.loads(line)
  File "/opt/hostedtoolcache/Python/3.10.16/x64/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/opt/hostedtoolcache/Python/3.10.16/x64/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/opt/hostedtoolcache/Python/3.10.16/x64/lib/python3.10/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)

The docker based integration tests work as they actually detect that the IPFS api key is not set in that environment. Hence, they just skip the upload.