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Documents building a Portainer image from one or more feature branches and running it, with the gotchas that bite: build-image must get ENV=production (else it ships a dev eval-source-map client bundle that the default CSP blocks, hanging the UI on "Loading Portainer…"), CSP is on by default, first-run admin init needs --no-setup-token, and the admin password must be simple but >=12 chars. Referenced from CLAUDE.md. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>