Fix Dockerfile build

This will fix the Dockerfile where building is failing
because of a typo in PR #1529

Dockerfile

@@ -1,4 +1,4 @@
-FROM registry.access.redhat.com/ubi9/go-toolset@sha256:310fbbc9b2a6af87d730e244d5b20a1836df3ae295c290ffec2d4ef6a53a33f8
+FROM registry.access.redhat.com/ubi9/go-toolset@sha256:310fbbc9b2a6af87d730e244d5b20a1836df3ae295c290ffec2d4ef6a53a33f8 AS builder
 ARG BINARY_NAME=pipelines-as-code-controller
 COPY . /src
 WORKDIR /src