implement payroll generator v0.9

service/data-hub/business-engine/Dockerfile

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+# --- Build Stage ---
+FROM golang:1.22-alpine AS builder
+
+WORKDIR /app
+
+# Dependencies laden, bevor wir den Code kopieren, um den Layer-Cache zu nutzen
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+# sqlc generieren und App bauen
+# (Wir brauchen sqlc im Build-Container)
+RUN go install github.com/sqlc-dev/sqlc/cmd/sqlc@latest
+RUN sqlc generate
+RUN CGO_ENABLED=0 GOOS=linux go build -v -o /business-engine ./cmd/api
+
+# --- Final Stage ---
+FROM alpine:latest
+
+# Root-Zertifikate für sichere Verbindungen
+RUN apk --no-cache add ca-certificates
+
+# User anlegen, um nicht als root zu laufen
+RUN addgroup -S appgroup && adduser -S appuser -G appgroup
+USER appuser
+
+WORKDIR /home/appuser
+COPY --from=builder /business-engine .
+
+COPY config.yaml .
+
+EXPOSE 8080
+
+CMD ["./business-engine"]