ported alpine to europa

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

pkg/universe.dagger.io/alpine/test/image-version.cue

@@ -0,0 +1,22 @@
+package test
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/dagger/engine"
+	"universe.dagger.io/alpine"
+)
+
+dagger.#Plan & {
+	actions: {
+		build: alpine.#Build & {
+			// install an old version on purpose
+			version: "3.10.9"
+		}
+
+		check: engine.#Readfile & {
+			input:    build.output.rootfs
+			path:     "/etc/alpine-release"
+			contents: "3.10.9\n"
+		}
+	}
+}