Add AppVeyor

[Jean85]

Since #757 didn't work out, this is an attempt to have AppVeyor as a CI for Windows. I've took inspiration from the build that Symfony does: https://github.com/symfony/symfony/blob/master/.appveyor.yml

[untitaker]

AppVeyor is running now.

[ste93cry]

Just asking: why there are two tasks for AppVeyor (continuous-integration/appveyor/branch and continuous-integration/appveyor/pr)? Also can't we use the GitHub apps instead of the old OAuth integrations so that we can use the Checks feature?

[stayallive]

There are probably 2 builds 1 for the current branch and 1 for the result if the PR was merged (so target branch + pr) I believe.

pr:

git clone -q https://github.com/getsentry/sentry-php.git C:\projects\sentry-php
git fetch -q origin +refs/pull/759/merge:
git checkout -qf FETCH_HEAD

+refs/pull/759/merge is the branch GitHub auto-creates to check if it can be merged.

branch:

git clone -q --branch=fix/error_types-option https://github.com/getsentry/sentry-php.git C:\projects\sentry-php
git checkout -qf 2945301d9c04ef090300dc2f2c6aa26adeea0c15

[ste93cry]

Mmm, it's fine but now I'm wondering why Travis CI doesn't do the same...

[stayallive]

Possibly turned off. Looks like Travis only checks the "merged pr" branch (which would be fine for appveyor too I think).

[Jean85]

I agree, the build in the branch is superfluous.

[Jean85]

Build is green! No longer WIP, please review and merge.

[stayallive]

LGTM! 👍