initial codes

Dockerfile

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+FROM ubuntu:24.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV APP_DIR=/opt/containers/nats-registration-listener
+ENV DATA_DIR=${APP_DIR}/data
+
+# Minimal deps + Python + dos2unix for CRLF→LF
+RUN apt-get update && apt-get install -y --no-install-recommends \
+      bash curl jq ca-certificates tini python3 python3-pip dos2unix \
+ && rm -rf /var/lib/apt/lists/*
+
+# Python deps
+RUN pip3 install --no-cache-dir --upgrade nats-py
+
+# App payload (immutable inside image)
+RUN mkdir -p ${APP_DIR}/app/bin
+COPY files/nats-registration-listener.sh ${APP_DIR}/app/bin/nats-registration-listener.sh
+COPY files/entrypoint.sh /usr/local/bin/nats-registration-entrypoint
+COPY files/healthcheck.sh /usr/local/bin/nats-registration-healthcheck
+COPY files/nats_registration_listener.py /usr/local/bin/nats_registration_listener.py
+
+# Normalize line endings (in case files came from Windows) and set exec bits
+RUN dos2unix /usr/local/bin/nats-registration-entrypoint \
+             /usr/local/bin/nats-registration-healthcheck \
+             ${APP_DIR}/app/bin/nats-registration-listener.sh \
+             /usr/local/bin/nats_registration_listener.py \
+ && chmod +x /usr/local/bin/nats-registration-entrypoint \
+             /usr/local/bin/nats-registration-healthcheck \
+             ${APP_DIR}/app/bin/nats-registration-listener.sh
+
+WORKDIR ${APP_DIR}/app
+
+# Use tini as PID1; entrypoint validates env and execs the main script
+ENTRYPOINT ["/usr/bin/tini", "--", "/usr/local/bin/nats-registration-entrypoint"]
+CMD ["/opt/containers/nats-registration-listener/app/bin/nats-registration-listener.sh"]