Init Gitea README

druid/config/gitea/README.md

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+# `app.ini` Snippets 
+The main Gitea config file is located at `~/data/gitea/gitea/gitea/conf/app.ini`.
+
+Configure connection to postgres DB container.
+```
+[database]
+PATH = /data/gitea/gitea.db
+DB_TYPE = postgres
+HOST = postgres:5432
+NAME = gitea
+USER = gitea
+PASSWD = [Located at postgres_secrets.env]
+LOG_SQL = false
+SCHEMA = 
+SSL_MODE = disable
+```
+
+Disable OpenID as login option.
+```
+[openid]
+ENABLE_OPENID_SIGNIN = false
+ENABLE_OPENID_SIGNUP = false
+```
+
+Allow migrating from specific domains.
+```
+[migrations]
+ALLOWED_DOMAINS = gitlab.jafner.net, *.github.com, github.com
+```