Google Container Registry
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First, enter your hostname (one of gcr.io,us.gcr.io,asia.gcr.iooreu.gcr.io).
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Then, authenticate using your JSON service account file 
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After creating and connecting the integration, you can use Docker images from your GCR repository as a custom environment for your project. 
Your credentials are encrypted and securely stored in our database. When you delete this integration, we also wipe your GCR credentials from our systems.