Feature request: complex env vars

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Wouldn't it be nice if we could declare complex variables in .gitlab-ci.yml that would be available as json strings (or some other format) in environment variables?

We could use this syntax:

variables:
  MYLIST:
  - item1
  - item2
  MYMAP:
    key1: val1
    key2: val2
  MYSTRING: |
    line1
    line2

The resulting environment variables would be:

MYLIST='["item1","item2"]'
MYMAP='{"key1":"val1","key2":"val2"}'
MYSTRING="line1\nline2"

I suppose a simple yaml->json conversion would work, and be backward compatible.