docs: new root as prior history lost (orphan + GC); ~215 commits not recoverable

configs/taler-exchange-ansible/Containerfile

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+FROM docker.io/library/debian:trixie
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update -yqq && \
+    apt-get install -yqq \
+                   ansible \
+		   cron \
+                   git \
+                   locales \
+                   openssh-server \
+                   python3 \
+                   python3-debian \
+                   systemd \
+                   whois # mkpasswd provided by whois package
+
+RUN mkdir -p /etc/ansible/facts.d
+
+#####################################################################
+## WARNING: THIS ALLOWS FOR COMPLETELY UNAUTHENTICATED SSH SESSIONS #
+####### FOR TESTING ENVIRONMENT ONLY! ###############################
+RUN echo "root:$(mkpasswd -s </dev/null)" | chpasswd -e
+RUN sed -i'' -e's/^#PermitRootLogin prohibit-password$/PermitRootLogin yes/' /etc/ssh/sshd_config \
+        && sed -i'' -e's/^#PasswordAuthentication yes$/PasswordAuthentication yes/' /etc/ssh/sshd_config \
+        && sed -i'' -e's/^#PermitEmptyPasswords no$/PermitEmptyPasswords yes/' /etc/ssh/sshd_config \
+        && sed -i'' -e's/^UsePAM yes/UsePAM no/' /etc/ssh/sshd_config