There are multiple ways to install bigquery-grafana datasource plugin, please choose one below:
Install from grafana.net
Use the grafana-cli
grafana-cli --pluginUrl https://github.com/doitintl/bigquery-grafana/archive/2.0.2.zip plugins install doitintl-bigquery-datasource
Copy files to your Grafana plugin directory. Restart Grafana, check datasources list at http://your.grafana.instance/datasources/new, and choose BigQuery option.
Add the below to your values.yaml
...
## Pass the plugins you want installed as a list.
##
plugins:
- https://github.com/doitintl/bigquery-grafana/archive/2.0.2.zip;doit-bigquery-datasource
grafana.ini:
plugins:
allow_loading_unsigned_plugins: doitintl-bigquery-datasource
...
for more details please see grafana helm chart