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" {
@@ -39,4 +44,4 @@ setup() {
 
     "$DAGGER" --europa up ./user.cue
     "$DAGGER" --europa up ./workdir.cue
-}
+}