Update golang Docker tag to v1.20.4

.github/workflows/build-docker-image.yaml

@@ -14,7 +14,7 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v2
       - name: Login to GHCR
         uses: docker/login-action@v2
         if: github.event_name != 'pull_request'

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.18.4-alpine3.16 as build
+FROM golang:1.20.4-alpine3.16 as build
 WORKDIR /build
 COPY . .
 RUN go get -d -v .