package test import ( "dagger.io/dagger" "dagger.io/dagger/engine" "universe.dagger.io/docker" "universe.dagger.io/alpine" ) dagger.#Plan & { actions: { image: alpine.#Build run: docker.#Run & { "image": image.output cmd: { name: "/bin/sh" args: ["-c", "echo -n hello world >> /output.txt"] } } verify: engine.#ReadFile & { input: run.output.rootfs path: "/output.txt" } & { contents: "hello world" } } }