Add DATABRICKS_HOST env var for Databricks CLI auth

The Databricks CLI unified auth requires DATABRICKS_HOST to know which
workspace to authenticate against. Set it from DATABRICKS_SERVER_HOSTNAME.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: eakmanrq <6326532+eakmanrq@users.noreply.github.com>

Author: eakmanrq

.github/workflows/pr.yaml

@@ -313,6 +313,7 @@ jobs:
       SNOWFLAKE_WAREHOUSE: ${{ secrets.SNOWFLAKE_WAREHOUSE }}
       SNOWFLAKE_AUTHENTICATOR: SNOWFLAKE_JWT
       DATABRICKS_SERVER_HOSTNAME: ${{ secrets.DATABRICKS_SERVER_HOSTNAME }}
+      DATABRICKS_HOST: ${{ secrets.DATABRICKS_SERVER_HOSTNAME }}
       DATABRICKS_HTTP_PATH: ${{ secrets.DATABRICKS_HTTP_PATH }}
       DATABRICKS_ACCESS_TOKEN: ${{ secrets.DATABRICKS_ACCESS_TOKEN }}
       DATABRICKS_CLIENT_ID: ${{ secrets.DATABRICKS_CLIENT_ID }}