Disable Go workspace mode in goreleaser

go mod download in workspace mode resolves the union of all workspace
modules' dependencies. This includes k8s.io/kubernetes staging packages
at v0.0.0, which are not published as standalone modules and cause the
download to fail.

Setting GOWORK=off restricts the download to the root module. The local
replace directive for pkg/apis handles cross-module resolution without
workspace mode.

Author: thardeck

.goreleaser.yaml

@@ -5,6 +5,7 @@ project_name: fleet
 
 env:
   - CGO_ENABLED=0
+  - GOWORK=off
   - IS_HOTFIX={{ if isEnvSet "IS_HOTFIX"}}{{ .Env.IS_HOTFIX }}{{else}}false{{end}}
 
 release: