Add dockerfile and container build

Dockerfile

@@ -0,0 +1,28 @@
+FROM golang AS build
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY zooid zooid
+COPY cmd cmd
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o bin/zooid cmd/relay/main.go
+
+FROM gcr.io/distroless/base-debian12 AS run
+
+WORKDIR /
+
+COPY --from=build /app/bin/zooid /bin/zooid
+
+USER nonroot:nonroot
+
+EXPOSE 3334
+
+ENV CONFIG=/tmp/config
+ENV MEDIA=/tmp/media
+ENV DATA=/tmp/data
+
+ENTRYPOINT ["/bin/zooid"]