ci: microk8s add cleanup action

Author: ikreymer

.github/workflows/microk8s-ci.yaml

@@ -17,6 +17,12 @@ jobs:
   btrix-microk8s-test:
     runs-on: ubuntu-latest
     steps:
+      - name: Initial Disk Cleanup
+        uses: mathio/gha-cleanup@v1
+        with:
+          remove-browsers: true
+          verbose: true
+
       - uses: balchua/[email protected]
         with:
           channel: "1.25/stable"