chore: fix zsh completion on debian

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

.gitignore

@@ -3,6 +3,7 @@
 /share/fish/vendor_completions.d
 /share/man/man1
 /share/zsh/site-functions
+/share/zsh/vendor-completions
 /gh-cli
 .envrc
 /dist

.goreleaser.yml

@@ -106,3 +106,8 @@ nfpms: #build:linux
         dst: "/usr/share/fish/vendor_completions.d/gh.fish"
       - src: "./share/zsh/site-functions/_gh"
         dst: "/usr/share/zsh/site-functions/_gh"
+      # Debian/Ubuntu zsh does not look in /usr/share/zsh/site-functions by default,
+      # so we also install to vendor-completions. See https://github.com/cli/cli/issues/13166
+      - src: "./share/zsh/vendor-completions/_gh"
+        dst: "/usr/share/zsh/vendor-completions/_gh"
+        packager: deb

Makefile

@@ -33,10 +33,14 @@ manpages: script/build$(EXE)
 
 .PHONY: completions
 completions: bin/gh$(EXE)
-	mkdir -p ./share/bash-completion/completions ./share/fish/vendor_completions.d ./share/zsh/site-functions
+	mkdir -p ./share/bash-completion/completions ./share/fish/vendor_completions.d ./share/zsh/site-functions ./share/zsh/vendor-completions
 	bin/gh$(EXE) completion -s bash > ./share/bash-completion/completions/gh
 	bin/gh$(EXE) completion -s fish > ./share/fish/vendor_completions.d/gh.fish
 	bin/gh$(EXE) completion -s zsh > ./share/zsh/site-functions/_gh
+	# On Debian/Ubuntu the default zsh fpath does not include /usr/share/zsh/site-functions
+	# but does include /usr/share/zsh/vendor-completions, so we ship both paths in our
+	# .deb and .rpm packages. See https://github.com/cli/cli/issues/13166
+	cp ./share/zsh/site-functions/_gh ./share/zsh/vendor-completions/_gh
 
 .PHONY: lint
 lint: