FIX DOCKER FILE

Dockerfile

@@ -1,6 +1,6 @@
 
 FROM golang:alpine AS builder
-ARG BUILDPLATFORM=${BUILDPLATFORM:-linux/amd64}
+ARG BUILDARCH
 ARG version=not-set
 ARG SHORTSHA=not-set
 WORKDIR /app
@@ -9,7 +9,7 @@ COPY . .
 RUN go build -o bin/ddns \
     -ldflags "-X main.Shortsha=${SHORTSHA} \
     -X main.Version=${version} \
-    -X main.Aarch=${BUILDPLATFORM}" ./cmd
+    -X main.Aarch=${BUILDARCH}" ./cmd
 
 FROM alpine AS runner
 COPY --from=builder /app/bin/ddns /usr/bin/