Add Gitea and Mail modules with configuration and resources

- Created Gitea module with outputs, provider, and variables for deployment.
- Implemented Mail module including configuration for Dovecot and Postfix, along with necessary resources such as secrets, config maps, and deployments.
- Added Python script for bcrypt password hashing and integrated it into the Mail module.
- Defined persistent volumes and claims for Seafile module, along with Nginx configuration for serving content.
- Established necessary variables for all modules to ensure flexibility and configurability.

terraform/modules/mail/provider.tf

@@ -0,0 +1,13 @@
+terraform {
+  required_version = "~>1.8"
+  required_providers {
+    kubernetes = {
+      source  = "hashicorp/kubernetes"
+      version = "~>2.18"
+    }
+    scaleway = {
+      source  = "scaleway/scaleway"
+      version = "~>2.13"
+    }
+  }
+}