auto generate server key if not exists

Dockerfile

@@ -5,9 +5,12 @@ RUN apt-get update && apt-get install -y libpam0g-dev libpam-google-authenticato
 
 RUN ln -sf /usr/include/security/_pam_types.h /usr/include/security/pam_types.h
 
-RUN go get -d -tags pam github.com/tg123/sshpiper/sshpiperd
+ADD . /go/src/github.com/tg123/sshpiper/
 RUN go install -ldflags "$(/go/src/github.com/tg123/sshpiper/sshpiperd/ldflags.sh)" -tags pam github.com/tg123/sshpiper/sshpiperd
 
 EXPOSE 2222
 
+ADD entrypoint.sh /
+ENTRYPOINT ["/entrypoint.sh"]
+
 CMD ["/go/bin/sshpiperd"]

entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -euo pipefail
+
+
+if [ ! -f /etc/ssh/ssh_host_rsa_key ];then
+    ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
+fi
+
+exec "$@"