implemented integration tests for engine.#Pull + moved auth code separately for sharing code with other tasks later

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

plan/task/auth.go

@@ -0,0 +1,54 @@
+package task
+
+import (
+	"go.dagger.io/dagger/compiler"
+	"go.dagger.io/dagger/plancontext"
+)
+
+type authValue struct {
+	Target   string
+	Username string
+	Secret   *plancontext.Secret
+}
+
+// Decodes an auth field value
+//
+// Cue format:
+//   auth: [...{
+//     target:   string
+//     username: string
+//     secret:   string | #Secret
+//   }]
+func decodeAuthValue(pctx *plancontext.Context, v *compiler.Value) ([]*authValue, error) {
+	vals, err := v.List()
+	if err != nil {
+		return nil, err
+	}
+
+	authVals := []*authValue{}
+	for _, val := range vals {
+		authVal := authValue{}
+
+		target, err := val.Lookup("target").String()
+		if err != nil {
+			return nil, err
+		}
+		authVal.Target = target
+
+		username, err := val.Lookup("username").String()
+		if err != nil {
+			return nil, err
+		}
+		authVal.Username = username
+
+		secret, err := pctx.Secrets.FromValue(val.Lookup("secret"))
+		if err != nil {
+			return nil, err
+		}
+		authVal.Secret = secret
+
+		authVals = append(authVals, &authVal)
+	}
+
+	return authVals, nil
+}