Can't find dialect for 'datasource1' data source: undefined

**Describe the bug**
I have 2 datasources im trying to access from the same cube instance, the default datasource works as expected(in my case big query), once i configure and try to access the second datasource(in my case postgres) i get the following error:
Can't find dialect for 'datasource1' data source: undefined

**To Reproduce**
Steps to reproduce the behavior:
Configuring more then 1 (non default datasource) datasource leads to unknown dialect.
in my case the default is big query and the second data source is postgres configured as follows:
```
CUBEJS_DB_BQ_PROJECT_ID=******************************
CUBEJS_DB_BQ_CREDENTIALS=******************************
CUBEJS_DB_TYPE=bigquery
CUBEJS_REFRESH_WORKER=false
CUBEJS_DATASOURCES=default,datasource1
CUBEJS_DS_datasource1_DB_TYPE=postgres
CUBEJS_DS_datasource1_DB_HOST=******************************
CUBEJS_DS_datasource1_DB_NAME=******************************
CUBEJS_DS_datasource1_DB_USER=******************************
CUBEJS_DS_datasource1_DB_PASS=******************************
```

**Expected behavior**
dialect(afaik postgres) is configured so i would expect the query to run as correctly

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Version:**
0.33.35