Examples for common use-cases

[jonhoo]

We recently made the decision to have this repository provide building blocks for CI (and a single, "80%" default template), since we found it too difficult to expose all the various ways in which people want their CI builds to vary. However, this repository can still serve as a convenient reference for how to implement particularly common patterns in your own CI scripts.

Here are some examples we should probably provide (PRs welcome!):

• Producing GitHub artifacts (Help people with producing GitHub artifacts #23)
• How to enable caching (Document what's going on in terms of caching #36)
• Uploading documentation to GitHub pages (Support for uploading documentation to ghp #35)
• Producing crates.io releases (Template for performing release to crates.io #34)
• Verifying minimal dependency versions (Should we verify minimal dependency versions #25)
• Compile with scache (sccache support? #16)
• Adding additional arguments to cargo invocations (Handling additional arguments #10)
• Installing programs uploaded to GitHub releases (Support installing programs uploaded to github releases #4)

If you have others, please post here and I'll add them!