diff --git a/.github/workflows/ceph.yml b/.github/workflows/ceph.yml
index ea5638c..83292a8 100644
--- a/.github/workflows/ceph.yml
+++ b/.github/workflows/ceph.yml
@@ -26,6 +26,14 @@
         description: 'Run the build with tmate debugging enabled (https://github.com/marketplace/actions/debugging-with-tmate)'
         required: false
         default: false
+      network_backend:
+        type: choice
+        description: 'Network backend type'
+        required: true
+        default: 'ovn'
+        options:
+          - openvswitch
+          - ovn
 
 jobs:
   debug:
@@ -33,12 +41,8 @@
     if: github.event_name == 'workflow_dispatch' && inputs.debug_enabled
     strategy:
       fail-fast: false
-      matrix:
-        network_backend:
-          - openvswitch
-          - ovn
     concurrency:
-      group: ${{ github.ref }}-${{ matrix.network_backend }}
+      group: ${{ github.ref }}-${{ inputs.network_backend }}
       cancel-in-progress: true
     steps:
       - name: Checkout project
@@ -65,6 +69,8 @@
 
       - name: Run Molecule Converge
         run: poetry run molecule converge -s ceph
+        env:
+          ATMOSPHERE_NETWORK_BACKEND: ${{ inputs.network_backend }}
 
       # Enable tmate debugging of manually-triggered workflows if the input option was provided
       - name: Setup tmate session