tests: added test for Pull with registry auth

Signed-off-by: Sam Alba <samalba@users.noreply.github.com>

tests/tasks.bats

@@ -6,7 +6,12 @@ setup() {
 
 @test "task: #Pull" {
     cd "$TESTDIR"/tasks/pull
-    "$DAGGER" --europa up
+    "$DAGGER" --europa up ./pull.cue
+}
+
+@test "task: #Pull with auth" {
+    cd "$TESTDIR"/tasks/pull
+    "$DAGGER" --europa up ./pull_auth.cue
 }
 
 @test "task: #ReadFile" {

tests/tasks/pull/pull_auth.cue

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"alpha.dagger.io/europa/dagger/engine"
+)
+
+engine.#Plan & {
+	actions: pull: engine.#Pull & {
+		source: "alpine:3.15.0@sha256:e7d88de73db3d3fd9b2d63aa7f447a10fd0220b7cbf39803c803f2af9ba256b3"
+	} & {
+		// assert result
+		digest: "sha256:e7d88de73db3d3fd9b2d63aa7f447a10fd0220b7cbf39803c803f2af9ba256b3"
+		config: {
+			Env: ["PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"]
+			Cmd: ["/bin/sh"]
+		}
+	}
+}