Optimize Docker Builds

Dockerfile

@@ -1,9 +1,9 @@
-FROM bufbuild/buf:latest AS buf-builder
+FROM --platform=$BUILDPLATFORM bufbuild/buf:latest AS buf-builder
 WORKDIR /opt/protobuf
 COPY protobuf /opt/protobuf
 RUN buf generate
 
-FROM node:alpine AS node-builder
+FROM --platform=$BUILDPLATFORM node:alpine AS node-builder
 WORKDIR /opt
 COPY webui /opt/webui
 COPY --from=buf-builder /opt/protobuf /opt/protobuf
@@ -13,23 +13,24 @@ RUN cd protobuf \
  && npm install \
  && npm run build
 
-FROM golang:alpine AS go-builder
+FROM --platform=$BUILDPLATFORM golang:alpine AS go-builder
 ENV CGO_ENABLED=0
 ARG VERSION=untracked
+ARG TARGETOS TARGETARCH
 WORKDIR /opt
 COPY pkg /opt/pkg
 COPY cmd/server /opt/cmd/server
 COPY go.mod go.sum /opt/.
 COPY --from=buf-builder /opt/protobuf /opt/protobuf
 COPY --from=node-builder /opt/cmd/server/dist /opt/cmd/server/dist
 RUN apk --no-cache add ca-certificates \
- && go mod tidy \
- && go build -ldflags="-X github.com/AS203038/looking-glass/pkg/utils.release=${VERSION}" -o /opt/looking-glass /opt/cmd/server
+ && go mod download \
+ && GOOS=$TARGETOS GOARCH=$TARGETARCH go build -x -ldflags="-X github.com/AS203038/looking-glass/pkg/utils.release=${VERSION}" -o /opt/looking-glass /opt/cmd/server
 
-FROM scratch
-LABEL org.opencontainers.image.source https://github.com/AS203038/looking-glass
-LABEL org.opencontainers.image.description Yet another looking glass project
-LABEL org.opencontainers.image.licenses GPL-3.0-or-later
+FROM scratch AS final
+LABEL org.opencontainers.image.source=https://github.com/AS203038/looking-glass
+LABEL org.opencontainers.image.description="Yet another looking glass project"
+LABEL org.opencontainers.image.licenses=GPL-3.0-or-later
 WORKDIR /
 COPY --from=go-builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=go-builder /opt/looking-glass /looking-glass