On the f27 branch: Enable createiso generation on all arches and volume id substitution for bikeshed

Fixing createiso enablement for https://pagure.io/releng/issue/7074
Signed-off-by: Rashmi Nargundkar <rnargund@redhat.com>

fedora-modular.conf

@@ -98,7 +98,7 @@ createiso_skip = [
             'src': True
         }),
         ('^Server$', {
-            '*': True,
+            '*': False,
             'src': True
         }),
     ]
@@ -133,6 +133,7 @@ volume_id_substitutions = {
            'Beta': 'B',
              'TC': 'T',
         'Modular': 'M',
+        'Bikeshed': 'BS',
 }
 
 disc_types = {