setup infra for pusher service

go/Dockerfile.pusherservice

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+# golang two stage build
+FROM golang:1.25 AS first-stage
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+COPY . .
+
+WORKDIR /app/cmd/pusherservice
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o main
+RUN ls
+
+FROM alpine:latest AS second-stage
+# for health check
+RUN apk --no-cache add curl
+
+WORKDIR /app
+COPY --from=first-stage /app/cmd/pusherservice .
+RUN echo "copied over binary to production stage"
+CMD ["./main"]