✨ Add Dockerfile for containerization

Dockerfile

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+FROM golang:1.22.5-alpine AS builder
+
+WORKDIR /dodo
+
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+
+RUN go build -o dodo
+RUN echo "{}" > config.json
+
+FROM gcr.io/distroless/static-debian12:latest
+
+WORKDIR /dodo
+
+COPY --from=builder /dodo/dodo /dodo/dodo
+COPY --from=builder /dodo/config.json /dodo/config.json
+
+ENTRYPOINT ["./dodo", "-c", "/dodo/config.json"]
+CMD []