feat: update incus build process

- ensure unkin-ca-certificates are installed
- find the default incus remote and use that for images
- dont set publish_remote_name
- build incus images for the base image
- build puppet-base image for incus only
- ensure builds are made with the `build` profile
- only build 9.5+ for incus

images/almalinux/9.5/puppet-base/builds

@@ -0,0 +1 @@
+incus

images/almalinux/9.5/puppet-base/files/etc/yum.repos.d/puppet.repo

@@ -0,0 +1,4 @@
+[puppet]
+name=puppet repository
+baseurl=https://packagerepo.service.consul/puppet7/el/9-daily/x86_64/os/
+gpgkey=https://packagerepo.service.consul/puppet7/el/9-daily/x86_64/os/RPM-GPG-KEY-puppet-20250406

images/almalinux/9.5/puppet-base/variables.auto.pkrvars.hcl

@@ -0,0 +1,16 @@
+# almalinux/9.5/puppet-base
+incus_source = "almalinux9/base/latest"
+deploy_files_from_image = true
+use_incus = true
+packages = [
+  "puppet-agent",
+  "puppet-initial"
+]
+scripts_pre_packages = [
+  "dnf makecache",
+  "dnf update -y",
+]
+scripts_final = [
+  "dnf clean all",
+  "rm -rf /var/cache/dnf"
+]