BUG - SPICE Failing to Load Metakernel

[sdhoyt]

Description of the issue

When running imap-cli to kick off processing, the SPICE code used by the packet_files_to_dataset function is producing the following error:

 File "/Users/seho5886/repos/imap_processing/imap_processing/utils.py", line 386, in packet_file_to_datasets
    time_data = met_to_j2000ns(data[time_key])
  File "/Users/seho5886/repos/imap_processing/imap_processing/spice/time.py", line 44, in met_to_j2000ns
    return np.asarray(_sct2e_wrapper(sclk_ticks) * 1e9, dtype=np.int64)
  File "/Users/seho5886/repos/imap_processing/imap_processing/spice/kernels.py", line 157, in wrapper_ensure_spice
    raise SpiceyError(
spiceypy.utils.exceptions.SpiceyError: 
When calling a function requiring SPICE, we failedto load a metakernel. SPICE_METAKERNEL is not set,and time_kernels_only is not set to True --

Steps to reproduce the issue

Setup your repository to use commit e6b4dae from this PR: #788

Upload this L0 to the SDC if needed:
imap_lo_l0_raw_20240728_v001.pkts.zip

Then run:

imap_cli --instrument lo --data-level l1a --start-date 20240728 --version v001 --dependency "[{'instrument': 'lo', 'data_level': 'l0', 'descriptor': 'raw', 'version': 'v001','start_date': '20240728'}]"

Expected behavior (What should happen)

Processing should run without error and CDF should be created

Actual behavior (What does happen)

The following error is produced:

 File "/Users/seho5886/repos/imap_processing/imap_processing/utils.py", line 386, in packet_file_to_datasets
    time_data = met_to_j2000ns(data[time_key])
  File "/Users/seho5886/repos/imap_processing/imap_processing/spice/time.py", line 44, in met_to_j2000ns
    return np.asarray(_sct2e_wrapper(sclk_ticks) * 1e9, dtype=np.int64)
  File "/Users/seho5886/repos/imap_processing/imap_processing/spice/kernels.py", line 157, in wrapper_ensure_spice
    raise SpiceyError(
spiceypy.utils.exceptions.SpiceyError: 
When calling a function requiring SPICE, we failedto load a metakernel. SPICE_METAKERNEL is not set,and time_kernels_only is not set to True --

Code Snippet:

Code

Additional notes, affected areas, and suggested fixes

No response