Support specifying a custom rails command #614
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Since #609 has been pretty silent, I'm not sure whether you would want to support specifying a custom command. I'm also not sure whether I covered all cases (probably not). However, these changes allow me to use the rails executable in a docker context and unblock me from not being able to use the plugin's full functionality.
I mainly need these changes to run our test suite. Our dev environment is configured to use a containerized database for testing. We also have a containerized redis instance tightly coupled to rails. So some functionality provided by the plugin would simply fail because rails can't reach the redis instance.
Fixes #609