ci: Fix broken key importing

[radeksimko]

gpg apparently uses tty for printing warnings (in this case likely about trust level for the new key)

Because there's no valid tty in GitHub Actions (or any other CI) we reflect that by passing extra flags to gpg.

This should address the following error during release:

gpg: key 34365D9472D7468F/B0B441097685B676: error sending to agent: Inappropriate ioctl for device
gpg: error reading '[stdin]': Inappropriate ioctl for device
gpg: import from '[stdin]' failed: Inappropriate ioctl for device

If this doesn't work then we can consider swapping that echo | gpg command for https://github.com/hashicorp/ghaction-import-gpg which is used by most Terraform providers AFAIK.

[radeksimko]

I'm going to merge this now (without review) to try unblocking a release which is due, but post-merge reviews are welcomed.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
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