software/slapos-sr-testing: add python-mysqlcient for erp5 tests

software/slapos-sr-testing/software.cfg

@@ -6,6 +6,7 @@ extends =
   ../../component/git/buildout.cfg
   ../../component/pillow/buildout.cfg
   ../../component/python-cryptography/buildout.cfg
+  ../../component/python-mysqlclient/buildout.cfg
   ../../component/python-pynacl/buildout.cfg
   ../../component/quic_client-bin/buildout.cfg
   ../../component/python-backports-lzma/buildout.cfg
@@ -156,6 +157,7 @@ eggs =
   erp5.util
   ${python-pynacl:egg}
   ${python-cryptography:egg}
+  ${python-mysqlclient:egg}
   ${bcrypt:egg}
   slapos.libnetworkcache
   supervisor
@@ -282,3 +284,4 @@ mock = 2.0.0
 testfixtures = 6.11
 funcsigs = 1.0.2
 PyPDF2 = 1.26.0
+mysqlclient = 1.3.12
\ No newline at end of file