apache-frontend: Provide CI configuration

Based on caddy-frontend tests

software/erp5testnode/testsuite/apache-frontend/README.md

+# Apache frontend test
+
+This software release is simply to run the test suite from `../caddy-frontend/test/setup.py`,
+but using apache-frontend software.

software/erp5testnode/testsuite/apache-frontend/software.cfg

+[buildout]
+
+extends =
+  ../caddy-frontend/software.cfg
+
+[configuration]
+test_software_release = ${:_profile_base_location_}/../../../apache-frontend/software.cfg
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