bug fixes: backend services patches - Implemented and deployed systemd-backed AMIs

docker/ec2/ami-images/ubuntu-20.04/Dockerfile

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+FROM public.ecr.aws/docker/library/ubuntu:20.04
+
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+        systemd \
+        systemd-sysv \
+        openssh-client \
+        openssh-server \
+        iproute2 \
+        iptables \
+        socat \
+        curl \
+        ca-certificates \
+    && systemctl enable ssh \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV container=docker
+STOPSIGNAL SIGRTMIN+3
+CMD ["/sbin/init"]

docker/ec2/ami-images/ubuntu-20.04/README.md

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+# Ubuntu 20.04 systemd EC2 guest
+
+Build the local guest image before launching `ami-0abcdef1234567892`:
+
+```text
+docker build --platform linux/amd64 -t floci/ami-ubuntu:20.04 docker/ec2/ami-images/ubuntu-20.04
+```
+
+The image runs systemd and starts SSH on every EC2 boot. Enable application services with
+`systemctl enable --now <service>` so they restart after `StopInstances` and `StartInstances`.