cmd: use homedir as default working directory for non-root users

[SandyXSD]

close #1851

[codecov-commenter]

Codecov Report

Merging #1869 (3c537b8) into main (38f36d0) will increase coverage by 0.00%.
The diff coverage is 76.92%.

@@           Coverage Diff           @@
##             main    #1869   +/-   ##
=======================================
  Coverage   61.34%   61.35%           
=======================================
  Files         135      135           
  Lines       23400    23410   +10     
=======================================
+ Hits        14355    14363    +8     
- Misses       7375     7376    +1     
- Partials     1670     1671    +1     

Impacted Files	Coverage Δ
cmd/flags.go	93.61% <75.00%> (-0.41%)	⬇️
cmd/mount_unix.go	49.07% <75.00%> (+0.99%)	⬆️
cmd/format.go	60.06% <80.00%> (-0.07%)	⬇️
pkg/chunk/disk_cache.go	79.85% <0.00%> (-0.98%)	⬇️
pkg/meta/redis.go	71.39% <0.00%> (-0.05%)	⬇️
pkg/fs/fs.go	77.66% <0.00%> (+0.78%)	⬆️

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