Use npm as fallback if no packageManager
specified
#190
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Fixes #180
#173 added a new
packageManager
input to allow users to optionally specify which package manager they'd like to use when running the action. If the value isn't specified, it attempts to infer the appropriate package manager based on the presence of a lockfile. However, if no lockfile is found it throws an error. This was an inadvertent breaking change.Instead of throwing an error when the input isn't specified and no lockfile is found, we should now fallback to the previous behavior of using npm. Specifying an unsupported package manager, however, throws an error.
This PR also refactors the package manager logic and tests into its own module.