add static-ssl feature to mirror curl/static-ssl

[Mythra]

I have some builds that I'd like to have produce a fully static binary, and for that I need to expose curl/static-ssl. I think for the general case having it dynamically linked is fine (I mean no one has complained thus far!), so I've left it out of the default features for now, but would be happy to add it there if you feel it's worth it.

Thanks!

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@4e662f0). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #225   +/-   ##
=========================================
  Coverage          ?   70.33%           
=========================================
  Files             ?       37           
  Lines             ?     2090           
  Branches          ?        0           
=========================================
  Hits              ?     1470           
  Misses            ?      620           
  Partials          ?        0           

Impacted Files	Coverage Δ
src/text.rs	70.68% <0.00%> (ø)
tests/timeouts.rs	84.61% <0.00%> (ø)
tests/request_body.rs	100.00% <0.00%> (ø)
src/request.rs	80.00% <0.00%> (ø)
src/cookies/psl/mod.rs	83.33% <0.00%> (ø)
test-util/src/mock.rs	68.75% <0.00%> (ø)
tests/methods.rs	100.00% <0.00%> (ø)
tests/response_body.rs	100.00% <0.00%> (ø)
src/metrics.rs	24.39% <0.00%> (ø)
src/auth.rs	59.37% <0.00%> (ø)
... and 27 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4e662f0...cbef04e. Read the comment docs.

[Mythra]

Hmmm Not sure why ubuntu-latest test failed, seemed to fail on something I didn't touch? Flake?

[sagebind]

Sorry about that, I'll take a look at CI tonight and figure out why it is failing.

Thanks for the PR though!

[sagebind]

Looks like a good addition. 👍

[sagebind]

Indeed it looks like one test has recently become flaky, but just on Ubuntu CI. I'll have to dig into that separately, but that's neither here nor there. 😉

I'll release this as version 0.9.9 so that you can start using it shortly.

[Mythra]

Thanks so much!

[sagebind]

A wild 0.9.9 has appeared! https://github.com/sagebind/isahc/releases/tag/0.9.9