feat(docker): adding docker image build support

docker/Dockerfile.api

@@ -0,0 +1,13 @@
+FROM golang:latest AS builder
+ARG CGO_ENABLED=0
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+
+RUN go build
+
+FROM scratch
+COPY --from=builder /app/realz /realz
+ENTRYPOINT ["/realz"]