ALBS-745: Add sigkeys param to the Jenkins jobs and pungi scripts

- Add parameter `sigkeys` to pungi-build.conf
- Change pkgset_source from `koji` to `kojimock`

pungi-build.conf.j2

@@ -30,7 +30,7 @@ hashed_directories = False
 tree_arches = ['{{ arch }}']
 
 # PKGSET
-pkgset_source = "koji"
+pkgset_source = "kojimock"
 koji_profile = "{{ product_name.lower() }}_{{ distribution_major_version }}"
 
 # PKGSET - KOJI
@@ -39,6 +39,13 @@ pkgset_koji_inherit = False
 pkgset_koji_module_tag = "dist-c8-module-compose"
 pkgset_allow_reuse = False
 
+
+sigkeys = [
+    {% for sigkey in sigkeys_fingerprints %}
+    "{{ sigkey }}",
+    {% endfor %}
+]
+
 filter_system_release_packages = False
 
 # GATHER