CI: .ecrc: Exclude temp from check (MR 4858)

Most things in temp come from Alpine's aports repository, which has
different rules and does not for example mandate that all files use tabs
instead of spaces. As such, let's not require packages in there to
conform to our rules.

.ecrc

 {
-  "SpacesAftertabs": true
+  "SpacesAftertabs": true,
+  "Exclude": ["temp"]
 }