Configuring environment variables for iOS build versioning and publishing

Open your Codemagic app settings, and go to the Environment variables tab.
Enter APP_STORE_CONNECT_PRIVATE_KEY as the Variable name.
Run the following command on the App Store Connect API key file that you downloaded earlier (in our example saved as codemagic_api_key.p8) to copy its content to clipboard:
```
cat codemagic_api_key.p8 | pbcopy
```
Paste into the Variable value field.
Enter a variable group name, e.g. appstore_credentials. Click the button to create the group.
Make sure the Secure option is selected so that the variable can be protected by encryption.
Click the Add button to add the variable.
Create variable APP_STORE_CONNECT_KEY_IDENTIFIER. The value is the Key ID field from App Store Connect > Users and Access > Keys.
Create variable APP_STORE_CONNECT_ISSUER_ID. The value is the Issuer ID field from App Store Connect > Users and Access > Keys.

Tip: Store all the of these variables in the same group so they can be imported to codemagic.yaml workflow at once.

Environment variables have to be added to the workflow either individually or as a group. Modify your codemagic.yaml file by adding the following:

workflows:
  ios-workflow:
    name: iOS Workflow
    environment:
        groups:
            - appstore_credentials

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