Improve disk UI and build performance

Dockerfile

@@ -1,11 +1,20 @@
-FROM golang:1.25-alpine AS builder
+# syntax=docker/dockerfile:1.7
+
+FROM --platform=$BUILDPLATFORM golang:1.25-alpine AS builder
 
 WORKDIR /src
+ARG VERSION=dev
+ARG TARGETOS
+ARG TARGETARCH
 COPY go.mod go.sum ./
-RUN go mod download
+RUN --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=cache,target=/root/.cache/go-build \
+    go mod download
 
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" \
+RUN --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=cache,target=/root/.cache/go-build \
+    CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -trimpath -ldflags="-s -w -X main.Version=${VERSION}" \
     -o /out/jukebox ./cmd/jukebox
 
 FROM alpine:3.19