Skip docker overlayfs mount point

[trim21]

Description

docker will mount some overlay fs, and get displayed when running df -T

...
overlay         overlay   236937040   65102840 159728780   29% /var/lib/docker/overlay2/72e95b1a20e559eb6d8f10d888365f898bf5da17c09cd6d2ba3fe5c0aa7c22b5/merged
overlay         overlay   236937040   65102840 159728780   29% /var/lib/docker/overlay2/cef03d67bf64ff7addc78d7938dedd6a0dcb4943412e4a9bb5b7083507420b55/merged

this mount path should be omitted by diskUsage util.

Related Issue

No

Screenshots

No

Types of changes

• Breaking change (changes that break backward compatibility of public API or CLI - semver MAJOR)
• New feature (non-breaking change which adds functionality - semver MINOR)
• Bug fix (non-breaking change which fixes an issue - semver PATCH)

[codecov]

Codecov Report

Merging #341 (624f1e9) into master (dafe036) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #341      +/-   ##
==========================================
- Coverage   70.78%   70.72%   -0.07%     
==========================================
  Files          62       62              
  Lines       11264    11264              
  Branches      697      696       -1     
==========================================
- Hits         7973     7966       -7     
- Misses       3291     3298       +7     

Impacted Files	Coverage Δ
server/util/diskUsageUtil.ts	51.26% <100.00%> (ø)
server/models/FeedReader.ts	83.78% <0.00%> (-9.46%)	⬇️

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