Attempt to add CAP_SYS_ADMIN for overlay storage driver

.github/workflows/build.yml

@@ -12,6 +12,8 @@ on:
   pull_request:
   workflow_dispatch: # allow manually triggering builds
 container:
+  cap_add:
+    - CAP_SYS_ADMIN
   volumes:
     - /dev/fuse:/dev/fuse:rw
 concurrency:
@@ -39,7 +41,7 @@ jobs:
         env:
           _BUILDAH_STARTED_IN_USERNS: ""
           BUILDAH_ISOLATION: chroot
-          STORAGE_DRIVER: zfs
+          STORAGE_DRIVER: overlay
         uses: blue-build/github-action@v1.8
         with:
           recipe: ${{ matrix.recipe }}