Fix broken git login

Author: ofilla

Dockerfile

@@ -7,6 +7,7 @@ RUN apk add --no-cache openssh git
 # -D flag avoids password generation
 # -s flag changes user's shell
 RUN adduser -D -s /usr/bin/git-shell git \
+    && passwd -u git \
     && mkdir -p /git-server/keys /git-server/repos ~git/.ssh
 
 # This is a login shell for SSH accounts to provide restricted Git access.

sshd_config

@@ -3,7 +3,7 @@ PermitRootLogin no
 PasswordAuthentication no
 AllowUsers git
 
-Match User git
-    X11Forwarding no
-    AllowTcpForwarding no
-    ForceCommand git-shell
+# other security measures
+X11Forwarding no
+AllowTcpForwarding no
+PermitTTY no