feat(edge/update): select endpoints to update [EE-4043] (#7602)

api/http/handler/edgeupdateschedules/agentversions.go

@@ -0,0 +1,32 @@
+package edgeupdateschedules
+
+import (
+	"net/http"
+
+	httperror "github.com/portainer/libhttp/error"
+	"github.com/portainer/libhttp/response"
+)
+
+// @id AgentVersions
+// @summary Fetches the supported versions of the agent to update/rollback
+// @description
+// @description **Access policy**: authenticated
+// @tags edge_update_schedules
+// @security ApiKeyAuth
+// @security jwt
+// @produce json
+// @success 200 {array} string
+// @failure 400 "Invalid request"
+// @failure 500 "Server error"
+// @router /edge_update_schedules/agent_versions [get]
+func (h *Handler) agentVersions(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
+	return response.JSON(w, []string{
+		"2.13.0",
+		"2.13.1",
+		"2.14.0",
+		"2.14.1",
+		"2.14.2",
+		"2.15",    // for develop only
+		"develop", // for develop only
+	})
+}