feat: Add Webdav (a.k.a HTTP Cache) support

[Xuanwo]

Signed-off-by: Xuanwo github@xuanwo.io

Fix #1171

[codecov-commenter]

Codecov Report

Base: 30.85% // Head: 30.87% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (5edfb33) compared to base (6a66de5).
Patch coverage: 19.04% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1597      +/-   ##
==========================================
+ Coverage   30.85%   30.87%   +0.01%     
==========================================
  Files          48       49       +1     
  Lines       16601    16637      +36     
  Branches     8019     8039      +20     
==========================================
+ Hits         5123     5136      +13     
- Misses       6210     6228      +18     
- Partials     5268     5273       +5     

Impacted Files	Coverage Δ
src/cache/cache.rs	38.95% <0.00%> (-1.28%)	⬇️
src/cache/webdav.rs	0.00% <0.00%> (ø)
src/config.rs	35.33% <25.92%> (-0.26%)	⬇️
tests/harness/mod.rs	44.18% <100.00%> (+0.65%)	⬆️
src/test/utils.rs	37.37% <0.00%> (-2.03%)	⬇️
src/cache/disk.rs	34.24% <0.00%> (-1.37%)	⬇️
src/server.rs	30.84% <0.00%> (-0.73%)	⬇️
src/util.rs	37.50% <0.00%> (ø)
src/mock_command.rs	53.03% <0.00%> (ø)
... and 9 more

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[sylvestre]

Maybe also add an integration test too?

…

Message ID: ***@***.***>

[sylvestre]

Could you please also reference it in the readme?
https://github.com/mozilla/sccache/blob/main/README.md

[Xuanwo]

DONE!

[dtretyakov]

@Xuanwo thanks for your work. Is it possible to provide credentials for WebDAV service?

[Xuanwo]

@Xuanwo thanks for your work. Is it possible to provide credentials for WebDAV service?

Yes! The feature has been added in new release of opendal: apache/opendal#1337.

I will add it in next PR.