implement compose secret syntax

model/gate.go

@@ -0,0 +1,23 @@
+package model
+
+// Gated indicates a build is gated and requires approval to proceed. It also
+// includes the reason the build was gated.
+type Gated struct {
+	Gated  bool   `json:"gated"`
+	Reason string `json:"reason"`
+}
+
+// GateService defines a service for gating builds.
+type GateService interface {
+	Gated(*User, *Repo, *Build) (*Gated, error)
+}
+
+type gateService struct{}
+
+func (s *gateService) Gated(owner *User, repo *Repo, build *Build) (*Gated, error) {
+	g := new(Gated)
+	if repo.IsPrivate && build.Event == EventPull && build.Sender != owner.Login {
+		g.Gated = true
+	}
+	return g, nil
+}