fix(promote): snapcraft cannot promote from edge with the --yes flag

[Guillaumebeuzeboc]

Since not being able to promote from edge with the --yes flag is by design we must trick snapcraft.

[Copilot]

Pull request overview

This PR addresses a limitation in snapcraft where promoting from the edge channel cannot be done non-interactively using the --yes flag. The solution pipes yes into the snapcraft promote command and sets the SNAPCRAFT_HAS_TTY environment variable to bypass this restriction.

Key Changes

• Replaced --yes flag with yes | pipe to provide interactive confirmation
• Added SNAPCRAFT_HAS_TTY: "true" environment variable to simulate TTY presence
• Added detailed comments explaining the workaround and referencing the upstream issue

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[artivis]

What is we simply published on candidate instead?

[Guillaumebeuzeboc]

What is we simply published on candidate instead?

But someone might want to use this workflow to promote from edge to beta.

[artivis]

Well we're not obliged to accommodate every use cases, especially if they deviate much from our opinionated/expected workflow.
Let's discuss that further.