bash.#Run: new and improved

* Script is written to filesystem, not inlined as argument
* Pass script either as string, or directory+filename

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

pkg/universe.dagger.io/bash/test/bash.bats

@@ -0,0 +1,10 @@
+setup() {
+    load '../../bats_helpers'
+
+    common_setup
+}
+
+@test "bash.#Run" {
+    dagger up ./run-simple
+}
+