stdlib: improved Docker package

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

stdlib/docker/image.cue

@@ -0,0 +1,41 @@
+package docker
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/dagger/op"
+)
+
+// Build a Docker image from source, using included Dockerfile
+#ImageFromSource: {
+	source: dagger.#Artifact
+
+	#up: [
+		op.#DockerBuild & {
+			context: source
+		},
+	]
+}
+
+// Fetch an image from a remote registry
+#ImageFromRegistry: {
+	ref: string
+
+	#up: [
+		op.#FetchContainer & {
+			"ref": ref
+		},
+	]
+}
+
+// Build a Docker image from the provided Dockerfile contents
+#ImageFromDockerfile: {
+	dockerfile: string
+	context:    dagger.#Artifact
+
+	#up: [
+		op.#DockerBuild & {
+			"context":    context
+			"dockerfile": dockerfile
+		},
+	]
+}