feat: add cache dir to --debug

[diivi]

fixes #5963
--debug output now:

➜  borg git:(master) ✗ ./borg-env/bin/borg -r /home/divyansh/Desktop/borg2 rlist --debug 
using builtin fallback logging configuration
38 self tests completed in 0.06 seconds
Verified integrity of /home/divyansh/Desktop/borg2/index.9
Enter passphrase for key /home/divyansh/Desktop/borg2: 
TAM-verified manifest
Using /home/divyansh/.cache/borg/496f0ecf408beb37acb21eac471aecaeae36e549fc70d1a49778e64413242cb9 as cache
security: read previous location '/home/divyansh/Desktop/borg2'
security: read manifest timestamp '2023-02-25T21:03:06.588359+00:00'
security: determined newest manifest timestamp as 2023-02-25T21:03:06.588359+00:00
security: repository checks ok, allowing access
Monday                               Sun, 2023-02-26 02:31:47 +0530 [0aec6822f0dc8c7e76ab2f26277beba306a54884764db4cd505931442da01045]
Tuesday                              Sun, 2023-02-26 02:33:06 +0530 [c9848cadcdecd1961d976d8474199e18d6296224e988f894245b9c5de2fba33e]

[codecov-commenter]

Codecov Report

Merging #7388 (7dd186c) into master (b208785) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master    #7388   +/-   ##
=======================================
  Coverage   83.90%   83.91%           
=======================================
  Files          67       67           
  Lines       11709    11710    +1     
  Branches     2133     2133           
=======================================
+ Hits         9825     9827    +2     
+ Misses       1320     1318    -2     
- Partials      564      565    +1     

Impacted Files	Coverage Δ
src/borg/cache.py	85.45% <100.00%> (+0.01%)	⬆️
src/borg/helpers/parseformat.py	90.74% <0.00%> (-0.16%)	⬇️
src/borg/archive.py	84.62% <0.00%> (ø)
src/borg/archiver/transfer_cmd.py	71.30% <0.00%> (ø)
src/borg/platform/base.py	81.45% <0.00%> (+1.61%)	⬆️

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[ThomasWaldmann]

LGTM.

[ThomasWaldmann]

Thanks!