Plug the WOPI validator into the pipeline

[petrsvihlik]

https://wopi.readthedocs.io/en/latest/build_test_ship/validator.html#validator

Plug it into the build pipeline: https://github.com/Microsoft/wopi-validator-core

[petrsvihlik]

https://stackoverflow.com/questions/58570404/wopi-validator-application-not-working-it-returns-404-not-found

[petrsvihlik]

@dviry what do you do to run the validator locally? (can you write steps?) I'd plug it into the gh actions pipeline...for now as a separate yaml but once we get it green, we could plug it into all the workflows. wdyt?

[petrsvihlik]

related to #182

[dviry]

... but the WOPI-Validator requires a running WopiHost and WopiHost.Web, how would you do that in GH-Actions? That would require starting at least a docker-composer instance (running in Docker would be anyway a future FR idea of mine)

[petrsvihlik]

true. well, at least we have a direction to explore :)

[dviry]

more for me to learn in the realm of GH-actions 😄

[dviry]

with #192 now having a single-server sample, maybe another option to try out