dblifecycle.gradle

apply plugin: DbPlugin

tasks.register("subtask1")
tasks.register("subtask2")

tasks.named("fixDbPermissions") {
    addStep subtask1
    addStep subtask2
}

class DbPlugin implements Plugin<Project> {
    void apply(Project project) {
        def createMinDb = project.tasks.register("createMinDb")
        def fixDbPerms = project.tasks.register("fixDbPermissions") {
            dependsOn createMinDb
            ext.addStep = { subtask ->
                dependsOn subtask
                subtask.mustRunAfter createMinDb
            }
        }
    }
}