Copy binary to runner in dockerfiles

[ijsnow]

Closes https://github.com/openfaas-incubator/rust-http-template/issues/5.

I also noticed that fprocess is main in rust*/template.yml but it's ./main in the dockerfile. Does that matter?

[derek[bot]]

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[derek[bot]]

Thank you for your contribution. I've just checked and your commit doesn't appear to be signed-off. That's something we need before your Pull Request can be merged. Please see our contributing guide. Tip: if you only have one commit so far then run: git commit --amend --signoff and then git push --force.

[thesurlydev]

@alexellis Would you mind merging?

[alexellis]

I'm going to get this closed due to its age, and the work being done in #9 that supersedes it.