.github: workflows: Place container storage inside work volume for merge

This commit updates the CI image merge job to place the Podman container
storage inside the runner work volume in order to ensure that sufficient
free space is available for the source images to be pulled.

Refer to d9bdf4b for more details.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

.github/workflows/ci.yml

@@ -175,6 +175,11 @@ jobs:
     if: ${{ github.event_name != 'pull_request' }}
 
     steps:
+    - name: Configure container storage
+      run: |
+        sed -i 's/graphroot = .*/graphroot = "\/__w\/container_storage"/' /etc/containers/storage.conf
+        mkdir -p /__w/container_storage
+
     - name: Login to DockerHub
       if: ${{ github.event_name != 'pull_request' }}
       uses: redhat-actions/podman-login@v1