Tidy up previous build files

Dockerfile

@@ -1,11 +1,13 @@
-FROM alpine:3.20
-
-ARG TARGETOS
-ARG TARGETARCH
-ARG TARGETVARIANT
+FROM golang:1.22.5-alpine3.20 AS builder
 
 WORKDIR /app
-COPY build/glance-$TARGETOS-$TARGETARCH${TARGETVARIANT} /app/glance
+COPY . /app
+RUN CGO_ENABLED=0 go build .
+
+FROM alpine:3.20
+
+WORKDIR /app
+COPY --from=builder /app/glance .
 
 EXPOSE 8080/tcp
 ENTRYPOINT ["/app/glance"]