Remove testing apps since CI will generate them now; disable PySide2 testing

.github/workflows/ci.yml

@@ -6,16 +6,24 @@ on:
       - main
   workflow_call:
 
+# Cancel active CI runs for a PR before starting another run
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
 defaults:
   run:
-    shell: bash  # https://github.com/beeware/briefcase/pull/912
+    shell: bash
+
+env:
+  FORCE_COLOR: "1"
 
 jobs:
   pre-commit:
     name: Pre-commit checks
     uses: beeware/.github/.github/workflows/pre-commit-run.yml@main
     with:
-      pre-commit-source: "pre-commit"
+      pre-commit-source: pre-commit
 
   verify-apps:
     name: Build apps
@@ -31,21 +39,9 @@ jobs:
       fail-fast: false
       matrix:
         python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12" ]
-        framework: [ "toga", "pyside2", "pyside6", "ppb", "pygame" ]
+        framework: [ "toga", "pyside6", "ppb", "pygame" ]
         exclude:
           # PyGObject cannot be built using the current version of Standalone Python
           # See https://github.com/indygreg/python-build-standalone/issues/194
           - python-version: "3.12"
             framework: "toga"
-          # PySide 2 doesn't publish binary wheels that are compatible with Python 3.11+
-          # and/or Ubuntu 22.04 (and is unlikely to ever do so.)
-          - python-version: "3.11"
-            framework: "pyside2"
-          - python-version: "3.12"
-            framework: "pyside2"
-          # PySide 6 doesn't currently publish binary wheels
-          # that are compatible with Python 3.11+ and/or Ubuntu 22.04
-          - python-version: "3.11"
-            framework: "pyside6"
-          - python-version: "3.12"
-            framework: "pyside6"