Adding support for variable value from secretKeyRef

[jtyr]

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This PR is adding support for fromValue.secretKeyRef for the Workspace resource. This allows to read a variable value from the specified secret key. This PR needs to be rebase after PR #133 is merged as it shares the GetSecretData method.

Usage in the Workspace resource:

...
spec:
  variables:
    - key: sensitive
      sensitive: true
      # This is the new feature
      valueFrom:
        secretKeyRef:
          name: test
          key: foo

Release note for CHANGELOG:

Added support for secretKeyRef for variables