添加webdav只读选项

[WeidiDeng]

No description provided.

[codecov]

Codecov Report

Merging #1629 (16089ad) into master (42a31f2) will increase coverage by 0.23%.
The diff coverage is 13.33%.

@@            Coverage Diff             @@
##           master    #1629      +/-   ##
==========================================
+ Coverage   89.09%   89.33%   +0.23%     
==========================================
  Files          99      103       +4     
  Lines        8541     8778     +237     
==========================================
+ Hits         7610     7842     +232     
- Misses        766      770       +4     
- Partials      165      166       +1     

Impacted Files	Coverage Δ
models/init.go	0.00% <0.00%> (ø)
models/webdav.go	88.23% <0.00%> (-11.77%)	⬇️
pkg/conf/conf.go	72.72% <ø> (ø)
routers/router.go	87.02% <100.00%> (+0.35%)	⬆️
pkg/wopi/discovery.go	94.54% <0.00%> (ø)
middleware/wopi.go	100.00% <0.00%> (ø)
pkg/wopi/types.go	100.00% <0.00%> (ø)
pkg/wopi/wopi.go	97.16% <0.00%> (ø)
pkg/serializer/setting.go	93.75% <0.00%> (+0.13%)	⬆️
... and 1 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[CLAassistant]

All committers have signed the CLA.