fix: use bare binary format for gh extension install

gh extension install expects bare binaries, not tar.gz archives.
The name_template already uses the correct hyphen-separated os-arch.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: maxbeizer

.goreleaser.yml

@@ -19,7 +19,7 @@ builds:
 archives:
   - id: default
     formats:
-      - tar.gz
+      - binary
     name_template: "{{ .ProjectName }}_{{ .Tag }}_{{ .Os }}-{{ .Arch }}"
 
 checksum: