Add deployment configuration templates

.gitea/deployment-vars.example.env

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+# Gitea repository Variables template (non-sensitive values only).
+# Create these under Repository Settings -> Actions -> Variables.
+# Do not place credentials or a webhook URL in this file.
+
+# Public HTTPS origin of the Gitea instance, without repository path/query/fragment.
+GITEA_BASE_URL=https://gitea.example.invalid
+
+# One URL path segment identifying the repository owner or organization.
+GITEA_OWNER=replace-with-gitea-owner