nixos/dependency-track: fix nginx config for frontend

Apparend I fell for some browser cache when implementing this in the
first place. This patch is based on the upstream nginx config.

5f318aca10/docker/etc/nginx/templates/default.conf.template

nixos/modules/services/web-apps/dependency-track.nix

@@ -509,9 +509,27 @@ in
       upstreams.dependency-track.servers."localhost:${toString cfg.port}" = { };
       virtualHosts.${cfg.nginx.domain} = {
         locations = {
-          "/".alias = "${cfg.package.frontend}/dist/";
+          "/" = {
+            alias = "${cfg.package.frontend}/dist/";
+            index = "index.html";
+            tryFiles = "$uri $uri/ /index.html";
+            extraConfig = ''
+              location ~ (index\.html)$ {
+                add_header Cache-Control "max-age=0, no-cache, no-store, must-revalidate";
+                add_header Pragma "no-cache";
+                add_header Expires 0;
+              }
+            '';
+          };
           "/api".proxyPass = "http://dependency-track";
-          "= /static/config.json".alias = frontendConfigFile;
+          "= /static/config.json" = {
+            alias = frontendConfigFile;
+            extraConfig = ''
+              add_header Cache-Control "max-age=0, no-cache, no-store, must-revalidate";
+              add_header Pragma "no-cache";
+              add_header Expires 0;
+            '';
+          };
         };
       };
     };

nixos/tests/dependency-track.nix

@@ -45,7 +45,9 @@ import ./make-test-python.nix (
         };
     };
 
-    testScript = ''
+    testScript =
+      # python
+      ''
         import json
 
         start_all()
@@ -61,6 +63,9 @@ import ./make-test-python.nix (
             server.succeed("curl http://localhost/api/version")
           )
           assert version["version"] == "${pkgs.dependency-track.version}"
+
+        with subtest("nginx serves frontend"):
+          server.succeed("curl http://localhost/ | grep \"<title>Dependency-Track</title>\"")
       '';
   }
 )