serverless: Replace STATICFILES_DIRS to point only to django/static (#382)

Co-authored-by: viseshrp <11642379+viseshrp@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: viseshrp

src/ansys/dynamicreporting/core/serverless/adr.py

@@ -431,8 +431,21 @@ def setup(self, collect_static: bool = False) -> None:
             overrides["DEBUG"] = self._debug
 
         overrides["MEDIA_ROOT"] = str(self._media_directory)
+
         if self._static_directory is not None:
+            # collect static files to this directory
             overrides["STATIC_ROOT"] = str(self._static_directory)
+            # collect static files from here
+            # Replace STATICFILES_DIRS to point only to the pre-collected directory in the Ansys installation.
+            source_static_dir = (
+                self._ansys_installation / f"nexus{self._ansys_version}" / "django" / "static"
+            )
+            if not source_static_dir.exists():
+                raise ImproperlyConfiguredError(
+                    f"The static files directory '{source_static_dir}' does not exist in the installation. "
+                    "Please check your Ansys installation and version."
+                )
+            overrides["STATICFILES_DIRS"] = [str(source_static_dir)]
 
         # relative URLs: By default, ADR serves static files from the URL /static/
         # and media files from the URL /media/. These can be changed using the