ejabberdctl: Document how to stop a debug shell: control+g

control+g is the correct way to enter shell break mode, as documented in
https://www.erlang.org/doc/apps/erts/tty

The ejabberdctl script included in installers use the included VT100,
and that may break when hitting control+c.
In that scenario let's explicitly recommend to not use control+c.

Thanks to Holger Weiß for the report.

.github/container/ejabberdctl.template

@@ -162,9 +162,11 @@ debugwarning()
         echo "Please be extremely cautious with your actions,"
         echo "and exit immediately if you are not completely sure."
         echo ""
-        echo "To detach this shell from ejabberd, press:"
-        echo "  control+c, control+c"
+        echo "To exit and detach this shell from ejabberd, press:"
+        echo "  control+g and then q"
         echo ""
+        #vt100 echo "Please do NOT use control+c in this debug shell !"
+        #vt100 echo ""
         echo "--------------------------------------------------------------------"
         echo "To bypass permanently this warning, add to ejabberdctl.cfg the line:"
         echo "  EJABBERD_BYPASS_WARNINGS=true"

ejabberdctl.template

@@ -149,9 +149,11 @@ debugwarning()
         echo "Please be extremely cautious with your actions,"
         echo "and exit immediately if you are not completely sure."
         echo ""
-        echo "To detach this shell from ejabberd, press:"
-        echo "  control+c, control+c"
+        echo "To exit and detach this shell from ejabberd, press:"
+        echo "  control+g and then q"
         echo ""
+        #vt100 echo "Please do NOT use control+c in this debug shell !"
+        #vt100 echo ""
         echo "--------------------------------------------------------------------"
         echo "To bypass permanently this warning, add to ejabberdctl.cfg the line:"
         echo "  EJABBERD_BYPASS_WARNINGS=true"

tools/make-binaries

@@ -411,6 +411,7 @@ edit_ejabberdctl()
 	    -e '/ERL_OPTIONS=/d' \
 	    -e 's|_DIR:=".*}/|_DIR:="/opt/ejabberd/|' \
 	    -e 's|/database|/database/$ERLANG_NODE|' \
+	    -e 's|#vt100 ||' \
 	    "$code_dir/bin/${rel_name}ctl"
 }
 #.