symlink in install phase

default.nix

@@ -39,6 +39,11 @@ let
       # Copy all application files
       cp -r $src/* $out/opt/usda-vision/
       
+      # Remove any existing .env files and create symlink to /var/lib location
+      rm -f $out/opt/usda-vision/management-dashboard-web-app/.env
+      rm -f $out/opt/usda-vision/.env
+      ln -s /var/lib/usda-vision/.env $out/opt/usda-vision/management-dashboard-web-app/.env
+      
       # Create convenience scripts
       mkdir -p $out/bin
       
@@ -55,7 +60,7 @@ let
       EOF
       
       cat > $out/bin/usda-vision-logs <<'EOF'
-      #!/usr/bin/env bash
+      #!/usr%bin/env bash
       cd $out/opt/usda-vision
       ${pkgs.docker-compose}/bin/docker-compose logs -f "$@"
       EOF
@@ -112,7 +117,6 @@ in
     systemd.tmpfiles.rules = [
       "d /var/lib/usda-vision 0755 root root -"
       "f /var/lib/usda-vision/.env 0644 root root -"
-      "L+ ${usda-vision-app}/opt/usda-vision/management-dashboard-web-app/.env - - - - /var/lib/usda-vision/.env"
     ];
 
     # Systemd service to manage usda-vision docker compose
@@ -122,6 +126,10 @@ in
       wants = [ "network-online.target" ];
       wantedBy = [ "multi-user.target" ];
       
+      preStart = ''
+        # Ensure .env file exists with defaults if empty
+        if [ ! -s /var/lib/usda-vision/.env ]; then
+          if [ -f ${usda-vision-app}/opt/usda-vision/.env.example ]; then
       preStart = ''
         # Ensure .env file exists with defaults if empty
         if [ ! -s /var/lib/usda-vision/.env ]; then
@@ -131,11 +139,7 @@ in
             echo "Please edit /var/lib/usda-vision/.env with your configuration"
           fi
         fi
-      '';
-      
-      serviceConfig = {
-        Type = "oneshot";
-        RemainAfterExit = true;
+      '';emainAfterExit = true;
         WorkingDirectory = "${usda-vision-app}/opt/usda-vision";
         User = "root";
         Group = "root";