[#403] Services fail to start

Problem: If node needs more time to start responding,
than baker/endorser services can wait for it, systemd
restart all the tezos services indefinetily.

Solution: Made tezos-node service be started only after it can respond.

docker/package/scripts/tezos-baker-start

@@ -56,6 +56,12 @@ launch_baker() {
     fi
 }
 
+# TODO we should use --keep-alive instead of this loop once
+# https://gitlab.com/tezos/tezos/-/issues/2873 is fixed
+# Waiting till node start to respond
+
+while ! "$tezos_client" --endpoint "$NODE_RPC_ENDPOINT" rpc list &> /dev/null; do sleep 1; done
+
 if [[ -z "$BAKER_ADDRESS_ALIAS" ]]; then
     launch_baker "$@"
 else