Build mir-libs for both core22 and core24

.github/workflows/snap.yml

@@ -42,20 +42,21 @@ jobs:
       with:
         fetch-depth: 0  # needed for version determination
 
-    - name: Build and publish the snap
+    - name: Tweak the snapcraft.yaml
       run: |
         if [ "${{ matrix.base }}" == "24" ]; then
           mv core24~snap/snapcraft.yaml snap/snapcraft.yaml
         fi
 
+    - name: Build and publish the snap
       uses: canonical/actions/build-snap@release
       with:
         architecture: ${{ matrix.architecture }}
         snapcraft-token: ${{ secrets.SNAPCRAFT_TOKEN }}
         launchpad-credentials: ${{ secrets.LAUNCHPAD_CREDENTIALS }}
         launchpad-accept-public-upload: true
         publish: ${{ github.event_name == 'pull_request' && github.repository == github.event.pull_request.head.repo.full_name }}
-        publish-channel: ${{ matrix.base }}/edge/pr${{ github.event.number }}
+        publish-channel: ${{ matrix.base }}\/edge/pr${{ github.event.number }}
 
   snap:
     # Only run if we have access to secrets.