Allow to read env vars from files inside the "env.d" directory

This makes it easier to set environment variables on some operating systems.
Setting configuration options from environment variables is recommended if
you want to avoid the time-consuming task of merging your changes with the
default configuration file after upgrading SFTPGo

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

pkgs/debian/postinst

@@ -24,15 +24,15 @@ if [ "$1" = "configure" ]; then
     sftpgo initprovider -c /etc/sftpgo
     # ensure files and folders have the appropriate permissions
     chown -R sftpgo:sftpgo /etc/sftpgo /var/lib/sftpgo /srv/sftpgo
-    chmod 750 /etc/sftpgo /var/lib/sftpgo /srv/sftpgo
+    chmod 750 /etc/sftpgo /etc/sftpgo/env.d /var/lib/sftpgo /srv/sftpgo
     chmod 640 /etc/sftpgo/sftpgo.json
   fi
 
-  # we added /srv/sftpgo after 1.1.0, we should check if we are upgrading
-  # from this version but a non-recursive chmod/chown shouldn't hurt
-  if [ -d /srv/sftpgo ]; then
-    chown sftpgo:sftpgo /srv/sftpgo
-    chmod 750 /srv/sftpgo
+  # we added /etc/sftpgo/env.d in v2.4.0, we should check if we are upgrading
+  # from a previous version but a non-recursive chmod/chown shouldn't hurt
+  if [ -d /etc/sftpgo/env.d ]; then
+    chown sftpgo:sftpgo /etc/sftpgo/env.d
+    chmod 750 /etc/sftpgo/env.d
   fi
 
   # set the cap_net_bind_service capability so the service can bind to privileged ports

pkgs/debian/sftpgo.dirs

@@ -1,2 +1,3 @@
 /var/lib/sftpgo
 /srv/sftpgo
+/etc/sftpgo/env.d