Europa: integrate core packages, separate universe

Signed-off-by: Solomon Hykes <solomon@dagger.io>

europa-universe/docker/test/bash/bash.cue

@@ -0,0 +1,15 @@
+package docker
+
+cmd: #Command & {
+	script: "echo hello world"
+	exec: {
+		name: "/bin/bash"
+		flags: {
+			"-c":          script
+			"--noprofile": true
+			"--norc":      true
+			"-e":          true
+			"-o":          "pipefail"
+		}
+	}
+}