gitea-1.14.x-updates (#148)

This PR includes the changes from:

- https://gitea.com/gitea/helm-chart/pulls/129
- https://gitea.com/gitea/helm-chart/pulls/140

In addition it adds the possibility to include secrets via environment variables as mentioned in #60

Co-authored-by: Hans Kristian Flaatten <hans.flaatten@evry.com>
Co-authored-by: flavio.prado <flavio.prado@noreply.gitea.io>
Co-authored-by: Lucas Hahn <lucas.hahn@novum-rgi.de>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/148
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: luhahn <luhahn@noreply.gitea.io>
Co-committed-by: luhahn <luhahn@noreply.gitea.io>

Chart.yaml

@@ -3,7 +3,7 @@ name: gitea
 description: Gitea Helm chart for Kubernetes
 type: application
 version: 0.0.0
-appVersion: 1.13.7
+appVersion: 1.14.1
 icon: https://docs.gitea.io/images/gitea.png
 
 keywords: