* Add ability to specify an existing Secret (#18139)

Closes #18139

* Allow using secrets with external postgres

* Upgrade CronJob to batch/v1

* Allow using redis.auth.existingSecret

* Helmignore mastodon-*.tgz for easy local development

* Upgrade helm dependencies

* Upgrade postgresql to 11

* Allow putting SMTP password into a secret

* Add optional login to SMTP secret

This to allow setting LOGIN either in values.yaml or
in the secret.

* Switch to bitnami charts full archive

This prevents older versions from disappearing, see
https://github.com/bitnami/charts/issues/10539 for
full context.

Co-authored-by: Ted Tramonte <ted.tramonte@gmail.com>

This adds a mastodon.streaming.base_url setting in the Helm chart values
file to allow setting the STREAMING_API_BASE_URL in the Mastodon environnment
config map.

* Bump version to 3.5.2

* Change some entries to be more clear

* Add some extra notes

* Fix line wrap

Co-authored-by: Eugen Rochko <eugen@zeonfederated.com>

Co-authored-by: Renovate Bot <bot@renovateapp.com>

* Add SAML support

* move extAuth below essential components

* Add CAS, PAM, LDAP support

* Add WEB_DOMAIN and S3_ALIAS_HOST support

* SAML defaults aligned

* Bump chart version

* SSO & WEB_DOMAIN support added

* Add OIDC support

* Correct typo

* Notice for OIDC support

Co-authored-by: Eugen Rochko <eugen@zeonfederated.com>

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Co-authored-by: Renovate Bot <bot@renovateapp.com>

this is a backwards-compatible upgrade: https://github.com/bitnami/charts/tree/master/bitnami/elasticsearch#to-1500

Co-authored-by: Renovate Bot <bot@renovateapp.com>

https://github.com/mastodon/mastodon/pull/10857

- move application variables under `mastodon` namespace
- restore standard yaml structure for ingress configuration
- move values.yaml.template to values.yaml

The cronjob tries to get key from `mastodon` secret instead of
`mastodon-postgresql` - so the cronjob fails with this error:

Error: couldn't find key postgresql-password in Secret [NS]/mastodon

Another solution is to save the postgres password in mastodon secret,
but that means that the password is placed in two places.

Postgresql use <fullname>-postgresql name as secret name.

* add Helm chart

known issues/future work:

- SSO is unsupported

- S3/Minio/GCS is unsupported

- Swift is unsupported

- WEB_DOMAIN is unsupported

- Tor is unsupported

* helm: clarify how LOCAL_DOMAIN is set

* helm: add chart description

* helm: make DB_POOL and Sidekiq concurrency configurable

* helm: only enforce pod affinity when using ReadWriteOnce

* helm: clarify compatibility

* helm: clean up application variables

* helm: add job to create initial admin