Improve Tinybird login experience

- This helps clean up the TB setup since we no longer need to install the CLI tools locally
- The service dependency chaining is a bit annoying here but it should all work
- We have to change some of the mounts around because of how TB works
  and where it expects tokens to be

tinybird/handleLogin.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# Check if already logged in
+if [[ -f "/home/tinybird/.tinyb" ]]
+then
+    echo "Tinybird already logged in"
+    exit 0
+fi
+
+# Login to Tinybird
+tb login --method code