feat: add Dockerfile for server-side build and deployment

Author: ainunns

docker/Dockerfile.serversideup

@@ -0,0 +1,21 @@
+FROM golang:1.23-alpine AS builder
+
+WORKDIR /build
+COPY . .
+
+RUN apk add --no-cache gcc musl-dev
+RUN go mod download
+RUN CGO_ENABLED=1 GOOS=linux go build -o /build/app .
+
+FROM alpine:latest
+
+WORKDIR /app
+RUN apk --no-cache add ca-certificates postgresql-client
+
+COPY --from=builder /build/app ./app
+COPY migrations/ ./migrations/
+RUN chmod +x ./app
+RUN mkdir -p assets
+
+EXPOSE 8080
+CMD ["./app"]