create ansible 9 build directory

```
mkdir 9/
cp 8/ansible.in 8/collection-meta.yaml 9/
ln -sr 8/ansible-8.0.0.deps 9/ancestor.deps
cat <<EOF >9/changelog.yaml
ancestor: 8.0.0
releases: {}
EOF
```

.github/workflows/antsibull-build.yml

@@ -19,6 +19,9 @@ jobs:
           - name: Ansible 8
             ansible_version: 8.99.0
             ansible_major_version: 8
+          - name: Ansible 9
+            ansible_version: 9.99.0
+            ansible_major_version: 9
 
     steps:
       - name: Check out antsibull

9/ancestor.deps

@@ -0,0 +1 @@
+../8/ansible-8.0.0.deps

9/ansible.in

@@ -0,0 +1,106 @@
+amazon.aws
+ansible.netcommon
+ansible.posix
+ansible.utils
+ansible.windows
+arista.eos
+awx.awx
+azure.azcollection
+check_point.mgmt
+chocolatey.chocolatey
+cisco.aci
+cisco.asa
+cisco.dnac
+cisco.intersight
+cisco.ios
+cisco.iosxr
+cisco.ise
+cisco.meraki
+cisco.mso
+cisco.nso
+cisco.nxos
+cisco.ucs
+cloud.common
+cloudscale_ch.cloud
+community.aws
+community.azure
+community.ciscosmb
+community.crypto
+community.digitalocean
+community.dns
+community.docker
+community.fortios
+community.general
+community.google
+community.grafana
+community.hashi_vault
+community.hrobot
+community.libvirt
+community.mongodb
+community.mysql
+community.network
+community.okd
+community.postgresql
+community.proxysql
+community.rabbitmq
+community.routeros
+community.sap
+community.sap_libs
+community.skydive
+community.sops
+community.vmware
+community.windows
+community.zabbix
+containers.podman
+cyberark.conjur
+cyberark.pas
+dellemc.enterprise_sonic
+dellemc.openmanage
+dellemc.powerflex
+dellemc.unity
+f5networks.f5_modules
+fortinet.fortimanager
+fortinet.fortios
+frr.frr
+gluster.gluster
+google.cloud
+grafana.grafana
+hetzner.hcloud
+hpe.nimble
+ibm.qradar
+ibm.spectrum_virtualize
+infinidat.infinibox
+infoblox.nios_modules
+inspur.ispim
+inspur.sm
+junipernetworks.junos
+kubernetes.core
+lowlydba.sqlserver
+microsoft.ad
+netapp.aws
+netapp.azure
+netapp.cloudmanager
+netapp.elementsw
+netapp_eseries.santricity
+netapp.ontap
+netapp.storagegrid
+netapp.um_info
+netbox.netbox
+ngine_io.cloudstack
+ngine_io.exoscale
+ngine_io.vultr
+openstack.cloud
+openvswitch.openvswitch
+ovirt.ovirt
+purestorage.flasharray
+purestorage.flashblade
+purestorage.fusion
+sensu.sensu_go
+servicenow.servicenow
+splunk.es
+theforeman.foreman
+t_systems_mms.icinga_director
+vmware.vmware_rest
+vultr.cloud
+vyos.vyos
+wti.remote

9/changelog.yaml

@@ -0,0 +1,2 @@
+ancestor: 8.0.0
+releases: {}