fix(config): make app.ini writable so Gitea can persist secrets on (re)deploy
Gitea 1.24+ (re)generates and SAVES the [oauth2] JWT secret to /etc/gitea/app.ini at LoadCommonSettings. With app.ini mounted directly as a read-only swarm config this fails fatally (open /etc/gitea/app.ini: read-only file system) on a warm reattach/redeploy, crash-looping the container before any DB migration. Mount the rendered config at /etc/gitea/app.ini.init (read-only) and seed it once into the writable config volume via docker-setup.sh, so Gitea owns a writable /etc/gitea/app.ini. Bumps DOCKER_SETUP_SH_VERSION so the new entrypoint actually deploys.
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