Setup Docker building.

Dockerfile

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+FROM golang:1.25.5-alpine AS builder
+
+RUN apk add --no-cache build-base
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=1 GOOS=linux go build -a -installsuffix cgo -o shagram ./cmd/server
+
+FROM alpine:latest
+RUN apk --no-cache add ca-certificates sqlite-libs
+
+WORKDIR /app
+COPY --from=builder /app/shagram .
+COPY static ./static
+COPY migrations ./migrations
+RUN mkdir -p /app/data
+
+EXPOSE 8080
+CMD ["./shagram"]