Add workflow which runs cli_tests with GnuPG 2.3.1

Author: ni4

.github/workflows/centos8.yml

@@ -37,6 +37,8 @@ jobs:
             GPG_VERSION: stable
           - BUILD_MODE: normal
             GPG_VERSION: beta
+          - BUILD_MODE: normal
+            GPG_VERSION: 2.3.1
           - BUILD_MODE: sanitize
             GPG_VERSION: stable
 

ci/lib/cacheable_install_functions.inc.sh

@@ -210,6 +210,10 @@ install_gpg() {
         _install_gpg component-git-ref 2501a48 f73605e      d9c4183   909133b   3df0cd3 0e2e53c  c6702d7
         # _install_gpg component-git-ref 7e45b50 c66594d      cf88dca   57cf9d6   4243085 6e8ad31  d4e5979
         ;;
+      "2.3.1")
+        #                              npth libgpg-error libgcrypt libassuan libksba pinentry gnupg
+        _install_gpg component-version 1.6  1.42         1.9.3     2.5.5     1.6.0   1.1.1    2.3.1
+        ;;
       *)
         >&2 echo "\$GPG_VERSION is set to invalid value: ${GPG_VERSION}"
         exit 1