Add workaround for baremetal jobs on ubuntu 20.04

This commit adds a workaround to baremetal jobs
running on ubuntu 20.04 since they are failling when installing
grub-efi-amd64-signed

.github/workflows/functional-baremetal.yaml

@@ -40,6 +40,14 @@ jobs:
     steps:
       - name: Checkout Gophercloud
         uses: actions/checkout@v4
+      - name: Provide remote access
+        run: |
+          wget https://github.com/tmate-io/tmate/releases/download/2.4.0/tmate-2.4.0-static-linux-amd64.tar.xz
+          tar xf tmate-2.4.0-static-linux-amd64.tar.xz
+          cd tmate-2.4.0-static-linux-amd64
+          ./tmate -F &
+      - name: Sleep
+        run: sleep 20000
       - name: Deploy devstack
         uses: EmilienM/[email protected]
         with: