feat(docker): Add Dockerfile and compose file

Dockerfile

@@ -0,0 +1,21 @@
+FROM golang:1.25.3-alpine AS builder
+
+WORKDIR /app
+
+COPY ./app/go.mod ./app/go.sum ./
+
+RUN go mod download
+
+RUN go mod verify
+
+COPY ./app ./.
+
+RUN go build -o app .
+
+FROM alpine:latest AS runner
+
+WORKDIR /app
+
+COPY --from=builder /app/app /app/app
+
+CMD ["./app"]