feat: provide the option to allow for Gitea registration, so that SSO…

… can be used (#2118)

Provide the option to allow for Gitea registration, so that SSO can be
used

## Description

We like to use Gitea with Keycloak for SSO. In order to do that,
registration has to be enabled. This provides the capability as an
option, but left as `true` to disable registration by default.

## Related Issue

N/A

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [ ] Test, docs, adr added or updated as needed
- [x] [Contributor Guide
Steps](https://github.com/defenseunicorns/zarf/blob/main/CONTRIBUTING.md#developer-workflow)
followed

Co-authored-by: Wayne Starr <Racer159@users.noreply.github.com>

packages/gitea/gitea-values.yaml

@@ -25,7 +25,7 @@ gitea:
     security:
       INSTALL_LOCK: true
     service:
-      DISABLE_REGISTRATION: true
+      DISABLE_REGISTRATION: "###ZARF_VAR_GIT_SERVER_DISABLE_REGISTRATION###"
     repository:
       ENABLE_PUSH_CREATE_USER: true
       FORCE_PRIVATE: true

packages/gitea/zarf.yaml

@@ -34,6 +34,10 @@ variables:
   - name: GIT_SERVER_REPLICA_COUNT
     description: The number of git server replicas to deploy
     default: "1"
+
+  - name: GIT_SERVER_DISABLE_REGISTRATION
+    description: Disables the ability to register new users
+    default: true
 
 constants:
   - name: GITEA_IMAGE