feat: fedora repo

- add fedora repo from git.unkin.net to images
- add correct unkin-ca-certificates
- add nfpm to rpmbuilder
- bump base/rpmbuilder images

images/fedora/44/base/files/etc/yum.repos.d/unkin.repo

@@ -0,0 +1,6 @@
+[gitea-unkin-fedora-44]
+name=Unkin Fedora 44
+baseurl=https://git.unkin.net/api/packages/unkin/rpm/fedora/44
+enabled=1
+gpgcheck=1
+gpgkey=https://git.unkin.net/api/packages/unkin/rpm/repository.key

images/fedora/44/base/variables.auto.pkrvars.hcl

@@ -4,7 +4,7 @@ deploy_files_from_image = true
 deploy_files_from_common = false
 scripts_pre_file_copy = [
   "rm -f /etc/yum.repos.d/*.repo",
-  "curl -sk -o unkin-ca-certificates.rpm https://git.unkin.net/unkin/-/packages/rpm/unkin-ca-certificates/2025.7.13-1/files/12294 && rpm -i unkin-ca-certificates.rpm",
+  "curl -sk -o unkin-ca-certificates.rpm https://git.unkin.net/unkin/-/packages/rpm/unkin-ca-certificates/2025.7.13-1.fc44/files/15656 && rpm -i unkin-ca-certificates.rpm",
 ]
 packages = [
   "git",