[FIX] mount with read-only in rclone

[prateekmedia]

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Currently rclone mounts with full permission on windows. this PR restricts it to read-only.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.90%. Comparing base (3dc0751) to head (58a6950).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #902   +/-   ##
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  Coverage   86.90%   86.90%           
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  Files          35       35           
  Lines        3695     3695           
  Branches      747      747           
=======================================
  Hits         3211     3211           
  Misses        348      348           
  Partials      136      136           

Flag	Coverage Δ
unittests	86.90% <ø> (ø)

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