chore: include common CMD used across all libraries (#7)

* chore: include common CMD used across all libraries

* fix: proper CMD settings

* fix: proper syntax

* chore: support overriding user/password

* fi: proper env syntax

Dockerfile

@@ -1,2 +1,8 @@
 FROM alpine:3.19.1
-RUN apk add --no-cache openssh && ssh-keygen -A && echo 'root:root' | chpasswd
+RUN apk add --no-cache openssh && ssh-keygen -A
+
+ENV USERNAME="root"
+ENV PASSWORD="root"
+
+ENTRYPOINT ["sh", "-c"]
+CMD ["echo ${USERNAME}:${PASSWORD} | chpasswd && /usr/sbin/sshd -D -o PermitRootLogin=yes -o AddressFamily=inet -o GatewayPorts=yes -o AllowAgentForwarding=yes -o AllowTcpForwarding=yes -o KexAlgorithms=+diffie-hellman-group1-sha1 -o HostkeyAlgorithms=+ssh-rsa"]