Convert all secrets to SealedSecrets for enhanced security
This commit converts all application secrets to SealedSecrets, preventing
plaintext secrets from being stored in git.
Changes:
- Added .gitignore to prevent future plaintext secret commits
- Created 20 SealedSecret manifests across 8 applications:
* Stalwart (4 secrets): admin credentials, OAuth proxy, OIDC, S3 backup
* Directus (5 secrets): admin, agent token, app secrets, DB, OIDC
* Paperclip (4 secrets): main secrets, auth, OIDC, session
* Forgejo (2 secrets): postgres, backup
* BookStack (2 secrets): OIDC, MySQL
* Passbolt (2 secrets): MariaDB, app secrets
* Pocket ID (1 secret)
- Removed hardcoded secrets from 6 stalwart deployment files
- Replaced plaintext credentials with references to sealed secrets
All sealed secrets have been applied to the cluster and services verified
to be running correctly.
Related: DEV-203
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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