Fix docker image name typo

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1 Ignored Deployment

| Name | Status | Preview | Updated (UTC) | | :--- | :----- | :------ | :------ | | **pioneer-testnet** | ⬜️ Ignored ([Inspect](https://vercel.com/joystream/pioneer-testnet/2VtVPvYHr8ApMKT2wq6WBAKzQPYm)) | | Jul 14, 2023 4:47pm |