feat(mail): enhance mail configuration with getmail and dovecot settings

- Added getmail configuration generation using template files.
- Introduced postfix and dovecot configuration checksums for deployment.
- Created new dovecot configuration file and sieve script for email handling.
- Updated main.tf to utilize local variables for configuration management.
- Removed redundant external password hasher from main.tf.

feat(nginx): improve nginx configuration management

- Centralized nginx configuration into a local variable with checksum.
- Created separate config maps for default website configurations.
- Updated deployment to utilize new configuration structure.

feat(sftpgo): add SFTPGo application deployment

- Introduced SFTPGo with Kubernetes resources including namespace, config maps, and secrets.
- Configured SFTPGo with SMTP settings and AWS credentials.
- Implemented health checks and volume mounts for persistent storage.

refactor(seafile): remove Seafile module

- Deleted Seafile module and associated resources as part of cleanup.

terraform/modules/apps/mail/resources/getmail/getmailrc.tpl

@@ -0,0 +1,20 @@
+[retriever]
+type = SimpleIMAPSSLRetriever
+server = ${server}
+port = ${port}
+username = ${username}
+password = ${password}
+mailboxes = ('${mailbox}',)
+
+[destination]
+type = MDA_lmtp
+host = ${dovecot_lmtp_address}
+port = ${dovecot_lmtp_port}
+override = ${recipient}@${domain}
+
+[options]
+read_all = false
+delete_after = ${delete_after}
+verbose = 1
+mark_read = true
+