support ssh authorized keys

Dockerfile

@@ -1,13 +1,15 @@
 FROM ubuntu:bionic
 
-# Nexus user for application usage
-RUN useradd --create-home nexus && \
-    echo "nexus:nexus" | chpasswd
-
 # Packages
 RUN apt-get update && \
     apt-get install -y nginx-light fcgiwrap supervisor openssh-server cron rsync python3-pip
 
+# Nexus user for application usage
+RUN useradd --create-home nexus && \
+    echo "nexus:nexus" | chpasswd && \
+    install -d /home/nexus/.ssh -o nexus -g nexus -m 700 && \
+    ln -s /data/nexus_authorized_keys /home/nexus/.ssh/authorized_keys
+
 # Misc conf
 RUN mkdir /start.d /nexus /var/run/sshd && \
     chown nexus /nexus && \

README.md

@@ -19,7 +19,8 @@ Nexus offers a couple services:
 
 For shell related activities, an sshd daemon runs on the standard port. Username and password, by default, is `nexus`.
 
-Mount `/data/keys` to persist host keys.
+Mount `/data/keys` to persist host keys. Ssh public keys in `/data/nexus_authorized_keys` will be authorized for the
+`nexus` user.
 
 
 ### Nginx