add php-lint tester

no-ci

t/php-lint/tests.sh

+TMP_DIR=`mktemp -d`
+chmod 777 ${TMP_DIR}
+touch "${TMP_DIR}/dumb php file with spaces.php"
+touch "${TMP_DIR}/ddumb_php_file_without_spaces.php"
+touch  "${TMP_DIR}/$(printf '\u03c0').php"
+docker run -it --rm -v "${TMP_DIR}:/work"  its-registry.unl.edu/unl-its/docker-ci/php-lint:latest php-lint -d /work
+echo $?
+