DevKit updates (#3974)

.github/ISSUE_TEMPLATE.md

@@ -44,4 +44,9 @@ $ php -v
 
 ## Actual results
 
-<!-- If it's an error message or piece of code, use code block tags. -->
+<!--
+    If it's an error message or piece of code, use code block tags,
+    and make sure you provide the whole stack trace(s),
+    not just the first error message you can see.
+    More details here: https://github.com/sonata-project/SonataAdminBundle/blob/3.x/CONTRIBUTING.md#issues
+-->

.styleci.yml

@@ -23,3 +23,5 @@ enabled:
 finder:
   exclude:
     - 'Tests/Fixtures'
+    # ecommerce special case:
+    - 'Resources/skeleton'

CONTRIBUTING.md

@@ -34,7 +34,8 @@ Github by following these points are taken care of:
 end of the page. Just look for "Stack Trace (Plain Text)", and copy/paste what
 you see. **Do not** make a screenshot of the stack trace, as screenshots are
 not indexed by search engines and will make it difficult for other people to
-find your bug report.
+find your bug report. If you have an issue when using the Symfony CLI,
+use the `-vvv` option to get a stack trace.
 * Screenshots should be considered additional data, and therefore, you should
   always provide a textual description of the bug. It is strongly recommended
 to provide them when reporting UI-related bugs.