Add dependency to mariadb

Signed-off-by: Petr "Stone" Hracek <phracek@redhat.com>

postfix.yaml

@@ -7,18 +7,20 @@ data:
         module: [ MIT ]
     dependencies:
         buildrequires:
-            base-runtime: master
+            base-runtime: f26
             # dependency on perl-generators
             perl: master
             # add dependency because of mariadb, postgresql, tinycdb
-            common-build-dependencies: master
-            common-build-dependencies-bootstrap: master
+            common-build-dependencies: f26
+            #common-build-dependencies-bootstrap: f26
             shared-userspace: f26
             postgresql: f26
+            mariadb: f26
         requires:
-            base-runtime: master
-            perl: master
-            postgresql: f26
+            base-runtime: f26
+            perl: f26
+            postgresql: private-f27-modules
+            mariadb: f26
     references:
         community: https://fedoraproject.org/wiki/Modularity
         documentation: https://fedoraproject.org/wiki/Fedora_Packaging_Guidelines_for_Modules