Allow spin up --variable to pass file content as a value
#3319
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Using the syntax
spin up --variable biscuit=@gingernut.txt.A motivation here is to allow a JSON document to be passed in a variable. While this can be worked around using the environment provider and bash interpolation, it's nice to allow it in
--variableas well (and key-value map files don't cut it because the escaping to format the JSON text as a JSON string value is a huge pain).