Change job_attrs type to text

[ericfranz]

The type for this is a string - this is dangerous when using this for a store. text should be used instead, which doesn't have the size limits that string has

https://github.com/AweSim-OSC/osc-jobconstructor/blob/68aadf2022b5f6b6243513d650a6fe46f406c338/db/schema.rb#L29

[brianmcmichael]

sqlite string max length = 2147483647
ruby string max length = 2**31 - 1

If this is an issue we shouldn't be using store

[ericfranz]

When specifying a rails type "string" this corresponds to a column in MySQL that has a limit of 255 characters and its the same (or similar) in Postgres. In Rails schemas "text" is the proper type to use for strings that are likely to exceed this limit, even if sqlite3 would let us get away with packing more into the column.

[ericfranz]

To clarify, in MySQL :string is mapped to VARCHAR which has the 255 char limit but :text is mapped to TINYTEXT, TEXT, MEDIUMTEXT, or LONGTEXT2 whose limit is much larger (max string length)

[brianmcmichael]

done be2bb3b