docs: how to generate a token and export to travis and appveyor

[rafajaques]

I had some trouble while trying to figure out how to properly set GH_TOKEN in Travis and AppVeyor.
So I decided to add some instructions in Wiki.

[develar]

Thanks for your contribution, docs is very important.

We recommend to use UI to add env on CI. https://github.com/electron-userland/electron-builder/wiki/Code-Signing#travis-appveyor-and-other-ci-servers (step 3 "Set CSC_LINK and CSC_KEY_PASSWORD"). I think, we should merge this info and extract it to a new document.

[rafajaques]

What do you suggest?
Creating a page for CI servers?

[develar]

What do you suggest?

I suggest to extract information how to set env using UI from Code-Signing to separate page (create new page). And add link to such page to Publishing Artifacts page.

[rafajaques]

I exported GH_TOKEN in Travis UI and everything went fine.
But in Appveyor it didn't work. It seems that the variable was not exported.
Any tips on that? Or should we use "encrypt data" in Appveyor?

[develar]

@rafajaques "In case of AppVeyor, don't forget to click on lock icon to “Toggle variable encryption”.

[rafajaques]

Isn't that so?

[develar]

@rafajaques Should be ok. Please open issue and attach log, clarify "it didn't work".

[rafajaques]

I'm rebuilding to see if it works.

[rafajaques]

Nevermind. It was a problem related to publishing windows --ia32 and --x64 at the same time.
Now that I have everything setup, I'll be back to docs.

[jwheare]

FWIW, I ended up writing a very similar version of these docs (with more code signing specifics) for our project here: https://github.com/irccloud/irccloud-desktop/blob/master/docs/OfficialBuilds.md