Pin older oras version to fix tests

Issue: PTFE-1367

.github/workflows/actions.yaml

@@ -68,14 +68,22 @@ jobs:
         # Fix libpcre2-posix2 package version, use the 
         sudo apt-get -y install --reinstall --allow-downgrades libpcre2-posix2/$(lsb_release -cs)
 
-        # Also need oras, skopeo ; but they are already installed
+        # Also need skopeo ; but it is already installed
 
         bash <(curl -s https://raw.githubusercontent.com/pgrange/bash_unit/master/install.sh)
 
         # Start cri-o service
         sudo systemctl start crio
       # TODO: cache the installed image?
 
+    - name: Downgrade Oras to 0.12.0
+      run: |
+        curl -LO https://github.com/oras-project/oras/releases/download/v${ORAS_VERSION}/oras_${ORAS_VERSION}_linux_amd64.tar.gz
+        tar -zxf oras_${ORAS_VERSION}_*.tar.gz -C /usr/local/bin/
+        rm -rf oras_${ORAS_VERSION}_*.tar.gz
+      env:
+        ORAS_VERSION: 0.12.0
+
     - name: Unit testing with bash_unit
       run: |
         export IMAGE="${{ env.DOCKER_IMAGE }}:${{ github.sha }}"