Cache being always missing about run-vcpkg

[otavio]

I am not a big fan of sub-modules as I think this is an external dependency and could be fetched during the build process.

Another nice feature of using it dynamically is if you ever need to test different versions of libraries, and in this case, this can be done using a matrix project.

[lukka]

After a quick look: is the vcpkg submodule cloned on disk by action/checkout?

[lukka]

My second look at it: the vcpkgGitCommitId: 2020.11-1 input is using a tag, which is not (yet) supported. Only explicit SHA-1 are accepted. This is a feature request tracked by #47

[otavio]

Ahh, thís explains it. I'll rework it and see if it helps.

[otavio]

Worked like a charm. It'd be nice if it could be mentioned on README as it would have saved me a bunch of time.

[lukka]

@otavio Glad to know! Feel free to submit a PR to augment the README.md.

Note that the README.md never mentions the vcpkgGitCommitId indeed, mostly because if the recommendation of "use vcpkg as a submodule" is followed then there is no need to set it at all :)

[lukka]

Check for vcpkgCommitId being a SHA1 hash added in [email protected], and improved docs as well.