AppVeyor: Add "secure" environment variables

⚠️ This page is currently out-of-date and may contain errors but is retained for historical reference.

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This is can be achieved in two steps:

• encrypt the value NAME=VALUE
• add result to appveyor.yml

Step-by-step:

• Click on Encrypt data

• Enter name and value to encrypt, then click Encrypt

• Update appveyor.yml adding section like this one where XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX corresponds to the encrypted value displayed in the previous step:

environment:
  my_variable:
    secure: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX