added bats test file

Signed-off-by: Richard Jones <richard@dagger.io>

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

@@ -0,0 +1,10 @@
+setup() {
+    load '../../bats_helpers'
+
+    common_setup
+}
+
+@test "alpine.#Build" {
+    "$DAGGER" up ./image-version.cue
+    "$DAGGER" up ./package-install.cue
+}