Use Ubuntu 22.04, same as gluwa/creditcoin repo

.github/provision-linode-vm.sh

@@ -36,7 +36,7 @@ while [ -z "$IP_ADDRESS" ]; do
     # All SSH logins should be via the `ubuntu@` user. For more info see:
     # https://www.linode.com/community/questions/21290/how-to-pass-multiple-ssh-public-keys-with-linode-cli-linodes-create
     linode-cli linodes create --json \
-        --image 'linode/ubuntu24.04' --region "$LINODE_REGION" \
+        --image 'linode/ubuntu22.04' --region "$LINODE_REGION" \
         --type "$LINODE_VM_SIZE" --label "$LC_RUNNER_VM_NAME" \
         --root_pass "$(uuidgen)" --backups_enabled false --booted true --private_ip false \
         --metadata.user_data "$(base64 --wrap 0 < .github/linode-cloud-init.template)" > "retry_$COUNTER.json"