# What this PR does
1. Fixes setting extra envs using:
```yaml
env:
proxy: http://example.com
SOME_VAR: some-value
```
It had failed if postgresql setting enabled and in `job-migrate`
2. Fixes an issue if custom database and username set for internal
mariadb, `MYSQL_` envs did not use them
```yaml
mariadb:
auth:
database: grafana_oncall
username: grafana_oncall
```
3. Added `imagePullSecrets: []` to values.yaml. It used in helm chart,
but does not present in the values.yaml
4. More unit tests
## Which issue(s) this PR fixes
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
Co-authored-by: Ildar Iskhakov <Ildar.iskhakov@grafana.com>
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