sketch: add missing tag to goreleaser config

It got lost during some git undo shenanigans.
diff --git a/.goreleaser.yml b/.goreleaser.yml
index 6e8ae18..71b255a 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -17,6 +17,8 @@
     goarch:
       - amd64
       - arm64
+    tags:
+      - outie
     ldflags:
       - -X main.release={{.Version}}
       - -X main.builtBy=goreleaser