preinstall: simplify OS packages selection

Since a2019c1c2 (Add a JSON schema describing the packages install
structure, 2024-04-25), we use a custom structure to select which
packages should be installed on a particular host OS.

This has proven too rigid in practice, and the query is pretty
complicated.

Replace this by simply using an array of jinja conditions for the
packages, which should be easier to understand for everyone and more
flexible.

Also remove the associated schema and validation which are no longer
needed.

roles/kubernetes/preinstall/vars/main.yml

@@ -1,103 +1,70 @@
 ---
 pkgs:
-  apparmor: &debian_family_base
-    os:
-      families:
-      - Debian
-  apt-transport-https: *debian_family_base
-  aufs-tools: &deb_10
-    groups:
-    - k8s_cluster
-    os:
-      distributions:
-        Debian:
-          major_versions:
-          - "10"
-  bash-completion: {}
-  conntrack: &deb_redhat
-    groups:
-    - k8s_cluster
-    os:
-      families:
-      - Debian
-      - RedHat
+  apparmor:
+    - "{{ ansible_os_family == 'Debian' }}"
+  apt-transport-https:
+    - "{{ ansible_os_family == 'Debian' }}"
+  aufs-tools:
+    - "{{ ansible_os_family == 'Debian' }}"
+    - "{{ ansible_distribution_major_version == '10' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  bash-completion: []
+  conntrack:
+    - "{{ ansible_os_family in ['Debian', 'RedHat'] }}"
+    - "{{ 'k8s_cluster' in group_names }}"
   conntrack-tools:
-    groups:
-    - k8s_cluster
-    os:
-      families:
-      - Suse
-      distributions:
-        Amazon: {}
-  container-selinux: &redhat_family
-    groups:
-    - k8s_cluster
-    os:
-      families:
-      - RedHat
-  curl: {}
+    - "{{ ansible_os_family == 'Suse' or ansible_distribution == 'Amazon' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  container-selinux:
+    - "{{ ansible_os_family == 'RedHat' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  curl: []
   device-mapper:
-    groups:
-    - k8s_cluster
-    os:
-      families:
-      - Suse
-  device-mapper-libs: *redhat_family
-  e2fsprogs: {}
-  ebtables: {}
-  gnupg: &debian
-    groups:
-    - k8s_cluster
-    os:
-      distributions:
-        Debian:
-          major_versions:
-          - "11"
-          - "12"
+    - "{{ ansible_os_family == 'Suse' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  device-mapper-libs:
+    - "{{ ansible_os_family == 'RedHat' }}"
+  e2fsprogs: []
+  ebtables: []
+  gnupg:
+    - "{{ ansible_distribution == 'Debian' }}"
+    - "{{ ansible_distribution_major_version in ['11', '12'] }}"
+    - "{{ 'k8s_cluster' in group_names }}"
   ipset:
-    enabled: "{{ kube_proxy_mode != 'ipvs' }}"
-    groups:
-    - k8s_cluster
-  iptables: *deb_redhat
+    - "{{ kube_proxy_mode != 'ipvs' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  iptables:
+    - "{{ ansible_os_family in ['Debian', 'RedHat'] }}"
   ipvsadm:
-    enabled: "{{ kube_proxy_mode == 'ipvs' }}"
-    groups:
-    - k8s_cluster
-  libseccomp: *redhat_family
+    - "{{ kube_proxy_mode == 'ipvs' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
+  libseccomp:
+    - "{{ ansible_os_family == 'RedHat' }}"
   libseccomp2:
-    groups:
-    - k8s_cluster
-    os:
-      families:
-      - Suse
-      - Debian
+    - "{{ ansible_os_family in ['Debian', 'Suse'] }}"
+    - "{{ 'k8s_cluster' in group_names }}"
   libselinux-python:  # TODO: Handle rehat_family + major < 8
-    os:
-      distributions:
-        Amazon: {}
+    - "{{ ansible_distribution == 'Amazon' }}"
   libselinux-python3:
-    os:
-      distributions:
-        Fedora: {}
+    - "{{ ansible_distribution == 'Fedora' }}"
   mergerfs:
-    os:
-      distributions:
-        Debian:
-          major_versions:
-          - "12"
-  nss: *redhat_family
-  openssl: {}
-  python-apt: *deb_10
-  # TODO: not for debian 10
-  python3-apt: *debian_family_base
+    - "{{ ansible_distribution == 'Debian' }}"
+    - "{{ ansible_distribution_major_version == '12' }}"
+  nss:
+    - "{{ ansible_os_family == 'RedHat' }}"
+  openssl: []
+  python-apt:
+    - "{{ ansible_os_family == 'Debian' }}"
+    - "{{ ansible_distribution_major_version == '10' }}"
+  python3-apt:
+    - "{{ ansible_os_family == 'Debian' }}"
+    - "{{ ansible_distribution_major_version != '10' }}"
   python3-libselinux:
-    os:
-      distributions:
-        RedHat: {}
-        CentOS: {}
-  rsync: {}
-  socat: {}
-  software-properties-common: *debian_family_base
-  tar: {}
-  unzip: {}
-  xfsprogs: {}
+    - "{{ ansible_distribution in ['RedHat', 'CentOS'] }}"
+  rsync: []
+  socat: []
+  software-properties-common:
+    - "{{ ansible_os_family == 'Debian' }}"
+  tar: []
+  unzip: []
+  xfsprogs: []