Add Dockerfile

Dockerfile

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+FROM ubuntu:22.04
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    JOTTA_TOKEN="**None**" \
+    JOTTA_DEVICE="docker-jottacloud" \
+    JOTTA_SCANINTERVAL="12h" \
+    LOCALTIME="Asia/Taipei" \
+    STARTUP_TIMEOUT=15 \
+    JOTTAD_SYSTEMD=0 \
+    TZ=UTC
+
+VOLUME ["/data"]
+
+# Base packages + Jottacloud repo
+RUN apt-get update -y && \
+    apt-get upgrade -y && \
+    apt-get install -y --no-install-recommends \
+      curl apt-transport-https ca-certificates expect tzdata psmisc gnupg && \
+    curl -fsSL https://repo.jotta.cloud/public.asc -o /usr/share/keyrings/jotta.gpg && \
+    echo "deb [signed-by=/usr/share/keyrings/jotta.gpg] https://repo.jotta.cloud/debian debian main" > /etc/apt/sources.list.d/jotta-cli.list && \
+    apt-get update -y && \
+    apt-get install -y --no-install-recommends jotta-cli && \
+    rm -rf /var/lib/apt/lists/*
+
+# Entrypoint
+COPY entrypoint.sh /src/entrypoint.sh
+RUN chmod +x /src/entrypoint.sh
+WORKDIR /src
+
+EXPOSE 14443
+ENTRYPOINT ["/src/entrypoint.sh"]