rename engine.#Build to engine.#Dockerfile

Signed-off-by: Richard Jones <richard@dagger.io>

tests/tasks/dockerfile/build_auth.cue

@@ -0,0 +1,39 @@
+package testing
+
+import (
+	"dagger.io/dagger/engine"
+	"encoding/yaml"
+)
+
+engine.#Plan & {
+	inputs: {
+		directories: testdata: path: "./testdata"
+		secrets: sops: command: {
+			name: "sops"
+			args: ["-d", "../../secrets_sops.yaml"]
+		}
+	}
+
+	actions: {
+		dockerHubToken: engine.#TransformSecret & {
+			input: inputs.secrets.sops.contents
+			#function: {
+				input:  _
+				output: yaml.Unmarshal(input)
+			}
+		}
+
+		build: engine.#Build & {
+			source: inputs.directories.testdata.contents
+			auth: [{
+				target:   "daggerio/ci-test:private-pull"
+				username: "daggertest"
+
+				secret: dockerHubToken.output.DOCKERHUB_TOKEN.contents
+			}]
+			dockerfile: contents: """
+				FROM daggerio/ci-test:private-pull@sha256:c74f1b1166784193ea6c8f9440263b9be6cae07dfe35e32a5df7a31358ac2060
+				"""
+		}
+	}
+}