test: add push-container

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

tests/push-container/main.cue

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/alpine"
+)
+
+TestPushContainer: {
+	// Generate a random number
+	random: {
+		string
+		#compute: [
+			dagger.#Load & {from: alpine.#Image},
+			dagger.#Exec & {
+				args: ["sh", "-c", "echo -n $RANDOM > /rand"]
+			},
+			dagger.#Export & {
+				source: "/rand"
+			},
+		]
+	}
+
+	// Push an image with a random tag
+	push: {
+		ref: "daggerio/ci-test:\(random)"
+		#compute: [
+			dagger.#WriteFile & {
+				content: random
+				dest:    "/rand"
+			},
+			dagger.#PushContainer & {
+				"ref": ref
+			},
+		]
+	}
+
+	// Pull the image back
+	pull: #compute: [
+		dagger.#FetchContainer & {
+			ref: push.ref
+		},
+	]
+
+	// Check the content
+	check: #compute: [
+		dagger.#Load & {from: alpine.#Image},
+		dagger.#Exec & {
+			args: [
+				"sh", "-c", #"""
+                test "$(cat /src/rand)" = "\#(random)"
+                """#,
+			]
+			mount: "/src": from: pull
+		},
+	]
+}