Add devices field to rpi-imager.json snippet

Author: foosel

.github/workflows/custopize.yml

@@ -209,6 +209,7 @@ jobs:
         image_size: ${{ steps.package-image.outputs.image_size }}
         zip_sha256: ${{ steps.package-image.outputs.zip_sha256 }}
         zip_size: ${{ steps.package-image.outputs.zip_size }}
+        devices: "pi4-32bit,pi3-32bit,pi2-32bit,pi1-32bit"
 
     - name: "🔖 Create release & attach assets"
       uses: softprops/action-gh-release@v1