Look for images and sbom assets also in the iso/ folder

After the latest changes of product-composer (allowing to build isos with different
names than ftp trees), the sbom assets are no longer saved in the root of the repo
(as they are for SLFO 1.0) and now live in the iso folder as well.

So look for those assets in both places.

gocd/rabbit-openqa.py

@@ -63,24 +63,24 @@ def map_iso(self, staging_project, iso):
     def gather_isos(self, name, repository):
         iso_set = set()
 
-        # Fetch /published/prj/repo/iso/*.iso
-        url = self.api.makeurl(['published', name, repository, 'iso'])
-        f = self.api.retried_GET(url)
-        root = ET.parse(f).getroot()
-        for entry in root.findall('entry'):
-            if entry.get('name').endswith('.iso'):
-                iso_set.add(self.map_iso(name, entry.get('name')))
-
-        # Fetch /published/prj/repo/*.{qcow2,raw.xz,spdx.json}
-        url = self.api.makeurl(['published', name, repository])
-        f = self.api.retried_GET(url)
-        root = ET.parse(f).getroot()
-        for entry in root.findall('entry'):
-            filename = entry.get('name')
-            if (filename.endswith('.qcow2') or
-                    filename.endswith('.raw.xz') or
-                    filename.endswith('.spdx.json')):
-                iso_set.add(self.map_iso(name, filename))
+        # Look for .iso and other images/sbom assets in the repository root and in the
+        # iso sub-folder of /published/prj/repo/
+        places = (
+            ['published', name, repository, 'iso'],
+            ['published', name, repository],
+        )
+        for place in places:
+            url = self.api.makeurl(place)
+            f = self.api.retried_GET(url)
+            root = ET.parse(f).getroot()
+
+            for entry in root.findall('entry'):
+                filename = entry.get('name')
+                if (filename.endswith('.qcow2') or
+                        filename.endswith('.raw.xz') or
+                        filename.endswith('.spdx.json') or
+                        filename.endswith('.iso')):
+                    iso_set.add(self.map_iso(name, filename))
 
         # Filter out isos which couldn't be mapped
         return [iso for iso in iso_set if iso]