(fix): Add hypens to pre-stable version tags

[buraksekili]

Description

This PR updates goreleaser configuration so that the images built with prerelease tag will have hyphen after semantic version, as follows: vX.Y.Z-beta1.

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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