Prototype: better git-flow

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

.dagger/env/hello-world

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+../../examples/hello-world

.dagger/env/sandbox/sandbox.cue

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+package main
+
+import (
+	"dagger.io/docker"
+	"dagger.io/io"
+)
+
+let ctr = docker.#Container & {
+	command: "echo 'hello world!' > /etc/motd"
+}
+
+motd: (io.#File & {
+	from: ctr
+	path: "/etc/motd"
+	read: format: "string"
+}).read.data
+
+etc: (io.#Dir & {
+	from: ctr
+	path: "/etc"
+}).read.tree