docker: use build script

Author: tulir

Dockerfile

@@ -4,7 +4,7 @@ RUN apk add --no-cache git ca-certificates build-base su-exec olm-dev
 
 COPY . /build
 WORKDIR /build
-RUN go build -o /usr/bin/mautrix-gmessages
+RUN ./build.sh
 
 FROM alpine:3.21
 
@@ -13,7 +13,7 @@ ENV UID=1337 \
 
 RUN apk add --no-cache ffmpeg su-exec ca-certificates olm bash jq yq-go curl
 
-COPY --from=builder /usr/bin/mautrix-gmessages /usr/bin/mautrix-gmessages
+COPY --from=builder /build/mautrix-gmessages /usr/bin/mautrix-gmessages
 COPY --from=builder /build/docker-run.sh /docker-run.sh
 VOLUME /data