fix docker GHA job

Author: Josh Ault

.github/workflows/build.yml

@@ -24,6 +24,8 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
+    - uses: actions/checkout@v4
+
     - uses: docker/setup-buildx-action@v3
 
     - uses: docker/metadata-action@v5

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.22 as builder
+FROM golang:1.22 AS builder
 WORKDIR /workspace
 COPY go.mod go.mod
 COPY go.sum go.sum