feat: add required packages for RHEL 8

tasks/install_packages.yml

 ---
-- name: include vars redhat_7_packages
-  ansible.builtin.include_vars: redhat_7_packages.yml
-  when: ( ansible_os_family == 'RedHat' ) and
-        ( ansible_distribution_major_version == "7" )
+- name: include vars redhat_{{ ansible_distribution_major_version }}_packages
+  ansible.builtin.include_vars: "redhat_{{ ansible_distribution_major_version }}_packages.yml"
+  when: ansible_os_family == 'RedHat'
 
 - name: install packages required by ExLibris and additional packages
   ansible.builtin.yum:

vars/redhat_8_packages.yml

+---
+# required RedHat 8 packages
+# as documented at https://knowledge.exlibrisgroup.com/Cross-Product/Cross-Product_Documentation/System_Requirements -> Operating System Requirements for Red Hat Enterprise Linux (page 13 and following)
+
+redhat_packages: [
+  'bc',
+  'binutils',
+  'compat-openssl10',
+  'dejavu-sans-fonts',
+  'dos2unix',
+  'elfutils-libelf',
+  'elfutils-libelf-devel',
+  'fontconfig.x86_64',
+  'fontconfig-devel',
+  'freetype.x86_64',
+  'glibc.x86_64',
+  'glibc-devel',
+  'keyutils-libs.i686',
+  'krb5-libs.i686',
+  'ksh',
+  'libaio',
+  'libaio-devel',
+  'libcom_err.i686',
+  'libgcc',
+  'libgcc.x86_64',
+  'libibverbs',
+  'libnsl',
+  'libnsl.i686',
+  'librdmacm',
+  'libselinux.i686',
+  'libstdc++',
+  'libstdc++-devel',
+  'libuuid.x86_64',
+  'libX11',
+  'libXau',
+  'libxcb',
+  'libxcrypt.i686',
+  'libXi',
+  'libxml2.i686',
+  'libXrender',
+  'libXtst',
+  'make',
+  'pcre2.i686',
+  'perl',
+  'policycoreutils',
+  'policycoreutils-python-utils',
+  'smartmontools',
+  'sysstat',
+  'tar',
+  'xz-libs.i686',
+  'zlib.i686',
+  'zlib.x86_64',
+]