feat: separated sources setup and patching

#181

Summary of changes:
- Separate sources setup and patching for cleaner workflow.

tox.ini

@@ -3,7 +3,7 @@ max-line-length = 100
 
 [tox]
 skipsdist = True
-envlist = {controller,ui}-{unit,lint,integration},integration,images-{setup,build,scan,publish}
+envlist = {controller,ui}-{unit,lint,integration},integration,images-{setup,patch,build,scan,publish}
 
 [vars]
 all_path = {[vars]src_path} {[vars]tst_path}
@@ -80,11 +80,19 @@ commands =
   # in image-definitions/ install tools and setup sources
   # install tools and setup sources
   bash -c 'cd ./image-definitions && ./install-tools.sh && ./setup.sh .'
+description = Install tools, setup upstream sources
+
+[testenv:images-patch]
+whitelist_externals = bash
+passenv =
+  HOME
+  USER
+commands =
   # check if ./kubeflow was updated since last commit
   bash -c 'cd ./image-definitions && ./check.sh'
   # apply patch for kubeflow/
   bash -c 'cd ./image-definitions && cd ./kubeflow && git apply ../kubeflow.patch'
-description = Install tools, setup sources, and apply patches
+description = Check for updates in sources and warn about commit difference, apply patch
 
 [testenv:images-build]
 whitelist_externals = bash