feat: add dockerfile

Dockerfile

@@ -0,0 +1,20 @@
+FROM golang:1.23 AS builder
+
+ARG TARGETOS
+ARG TARGETARCH
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -o ./result/unspeech ./cmd/unspeech
+
+FROM gcr.io/distroless/static-debian12 AS app
+
+COPY --from=builder /app/result/unspeech /
+
+ENTRYPOINT ["/unspeech"]