Make CI use cache and avoid tox. (#1215)

Author: janiversen

.github/greetings.yml

@@ -3,7 +3,7 @@ name: CI
 on:
   push:
     branches:
-      - dev*
+      - "*"
       - master
     tags:
       - v*

.github/stale.yml

@@ -0,0 +1,18 @@
+name: Clean
+on:
+  workflow_dispatch:
+  schedule:
+    # Daily at 05:20
+    - cron: '50 11 * * *'
+
+jobs:
+  del_runs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Delete workflow runs
+        uses: Mattraks/delete-workflow-runs@v2
+        with:
+          token: ${{ github.token }}
+          repository: ${{ github.repository }}
+          retain_days: 10
+          keep_minimum_runs: 6