Initial codex telegram bot source

Dockerfile

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+FROM golang:1.23-alpine AS build
+
+WORKDIR /src
+COPY go.mod go.sum* ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 go build -o /out/codex-telegram-bot ./cmd/bot
+
+FROM alpine:3.20
+
+RUN adduser -D -h /home/bot bot
+COPY --from=build /out/codex-telegram-bot /usr/local/bin/codex-telegram-bot
+
+USER bot
+ENTRYPOINT ["/usr/local/bin/codex-telegram-bot"]