chore(deb): sync entrypoint and Dockerfile from build/

- Replace legacy entrypoint with the current build/ version
  (PTY_TOOL support, init/manage/attach/run commands, SIGTERM trap,
  port-readiness liveness check, abduco session detection, <container>
  placeholder in error messages); only difference is binary name
  protonmail-bridge instead of /protonmail/proton-bridge
- Add ARG/ENV PTY_TOOL and conditional apt install of dtach/abduco/reptyr
- Add HEALTHCHECK on 127.0.0.1 for all four ports (25, 143, 1025, 1143)
- Switch from CMD bash ... to ENTRYPOINT + CMD ["run"]

deb/Dockerfile

@@ -12,6 +12,10 @@ RUN bash /install.sh
 FROM debian:sid-slim
 LABEL maintainer="Simon Felding <sife@adm.ku.dk>"
 
+# Select PTY tool for manage/attach commands: dtach (default), abduco, reptyr
+ARG PTY_TOOL=dtach
+ENV PTY_TOOL=${PTY_TOOL}
+
 EXPOSE 25/tcp
 EXPOSE 143/tcp
 
@@ -23,6 +27,17 @@ COPY --from=build /protonmail.deb /tmp/protonmail.deb
 
 RUN apt-get update \
     && apt-get install -y --no-install-recommends /tmp/protonmail.deb socat pass libsecret-1-0 ca-certificates procps \
+    && case "${PTY_TOOL}" in \
+         dtach)  apt-get install -y --no-install-recommends dtach  ;; \
+         abduco) apt-get install -y --no-install-recommends abduco ;; \
+         reptyr) apt-get install -y --no-install-recommends reptyr ;; \
+         *) echo "Unsupported PTY_TOOL: ${PTY_TOOL}. Supported values are: dtach, abduco, reptyr." >&2; exit 1 ;; \
+       esac \
+    && chmod +x /protonmail/entrypoint.sh \
     && rm -rf /var/lib/apt/lists/*
 
-CMD ["bash", "/protonmail/entrypoint.sh"]
+HEALTHCHECK --interval=30s --timeout=5s --retries=3 --start-period=120s \
+  CMD /bin/bash -c "true < /dev/tcp/127.0.0.1/25 && true < /dev/tcp/127.0.0.1/143 && true < /dev/tcp/127.0.0.1/1025 && true < /dev/tcp/127.0.0.1/1143"
+
+ENTRYPOINT ["/protonmail/entrypoint.sh"]
+CMD ["run"]