!file documentation

[mcandre]

Please show examples for how to configure directory and flat file paths, such as with read-only, write-only, and read-write, append, replace, byte, and text modes.

[m-ou-se]

!file is part of the Yaml file that cloudabi-run accepts, which it then converts to Argdata. (Argdata itself is just the binary encoding format.) So, I'm moving this issue to the cloudabi-utils repository, as cloudabi-run lives there.

[m-ou-se]

This is related to #2, and also to the discussion started yesterday on the mailing list: We need more flexible ways of launching CloudABI programs. @sgielen and I have planned to dive in to this tomorrow.