initial version

Dockerfile

@@ -0,0 +1,21 @@
+FROM debian:bookworm-slim
+
+RUN set -eux; \
+    apt-get update; \
+    DEBIAN_FRONTEND=noninteractive apt-get upgrade -y; \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+        openssh-server \
+        curl \
+        telnet \
+        net-tools \
+        screen \
+    ; \
+    rm -rf /var/lib/apt/lists/*
+
+ADD start.sh /
+
+EXPOSE 22/tcp
+
+CMD /start.sh
+
+HEALTHCHECK CMD netstat -tnlp | grep '0.0.0.0:22' || exit 1