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"
+		}
+	}
+}

pkg/universe.dagger.io/alpine/test/package-install.cue

@@ -0,0 +1,31 @@
+package test
+
+import (
+	"dagger.io/dagger"
+	"universe.dagger.io/alpine"
+	"universe.dagger.io/docker"
+)
+
+dagger.#Plan & {
+	actions: {
+		build: alpine.#Build & {
+			packages: {
+				jq: {}
+				curl: {}
+			}
+		}
+
+		check: docker.#Run & {
+			image: build.output
+			script: """
+				jq --version > /jq-version.txt
+				curl --version > /curl-version.txt
+				"""
+
+			export: files: {
+				"/jq-version.txt": contents:   =~"^jq"
+				"/curl-version.txt": contents: =~"^curl"
+			}
+		}
+	}
+}