Version (v)ery confussing

[mountainash]

Semi-related to #59

Setting the version "with" argument to the latest release causes the Action to fail/throw without an error 😿 (even when setting GHActions to run in "debug" mode).

I've tried the following variations of pinning the version:

  with:
    version: 0.2.80
OR
    version: v0.2.80
OR
    version: 'v0.2.80'

Without setting the version the Action installs the FLY CLI as expected, but it's installing an older version from https://github.com/superfly/flyctl/releases/download/v0.2.72/flyctl_0.2.72_Linux_x86_64.tar.gz

• could the version arg be checked for a v prefix and add/remove it if it's needed
• could a descriptive error be thrown when the binary can't be found

Extra: my preference would be to allow the version number to be pinned in D.D.DD format (without the v prefix to be inline with other popular Actions.