Allow the usage of gunicorn.conf.py config file in gunicorn applications

Fixes: sclorg#599

src/s2i/bin/run

@@ -106,8 +106,13 @@ fi
 
 if is_gunicorn_installed; then
   setup_py=$(find "$HOME" -maxdepth 2 -type f -name 'setup.py' -print -quit)
+  # Look for gunicorn>=20.1.0 to utilize gunicorn.conf.py
+  $(rpmdev-vercmp $(rpm -q --queryformat '%{VERSION}' python3-gunicorn) "20.1.0")
+  vercmp_result=$?
+  if [[ $ver -eq 11 || $ver -eq 0  ]] && [[ -f "gunicorn.conf.py"  ]]; then
+    echo "Using gunicorn.conf.py"
   # Look for wsgi module in the current directory
-  if [[ -z "$APP_MODULE" && -f "./wsgi.py" ]]; then
+  elif [[ -z "$APP_MODULE" && -f "./wsgi.py" ]]; then
     APP_MODULE=wsgi
   elif [[ -z "$APP_MODULE" && -f "$setup_py" ]]; then
     APP_MODULE="$(python "$setup_py" --name)"

test/run

@@ -6,7 +6,7 @@
 # IMAGE_NAME specifies a name of the candidate image used for testing.
 # The image has to be available before this script is executed.
 #
-declare -a COMMON_WEB_APPS=({gunicorn-config-different-port,gunicorn-different-port,django-different-port,standalone,setup,setup-requirements,django,numpy,app-home,locale,pipenv,pipenv-and-micropipenv-should-fail,app-module,pyuwsgi-pipenv{% if spec.version.startswith("3.") %},micropipenv,standalone-custom-pypi-index{% endif %}}-test-app)
+declare -a COMMON_WEB_APPS=({gunicorn-config-different-port,gunicorn-different-port,gunicorn-with-configfile-app-home-test-app,django-different-port,standalone,setup,setup-requirements,django,numpy,app-home,locale,pipenv,pipenv-and-micropipenv-should-fail,app-module,pyuwsgi-pipenv{% if spec.version.startswith("3.") %},micropipenv,standalone-custom-pypi-index{% endif %}}-test-app)
 declare -a FULL_WEB_APPS=({setup-cfg,npm-virtualenv-uwsgi,mod-wsgi,pin-pipenv-version{% if spec.version.startswith("3.") %},micropipenv-requirements,poetry-src-layout{% endif %}}-test-app)
 declare -a MINIMAL_WEB_APPS=()
 {% if spec.minimal %}