update `builder.yml` for better only release (fixes #880)

treehouses / builder

Treehouses Awesome 👓 Raspberry Pi Image Builder 🏗

http://download.treehouses.io

GNU Affero General Public License v3.0

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Closed rjpadilla closed 3 years ago

rjpadilla commented 3 years ago

Created another step to extract the release as an environmental variable.