Build verified checkpoint containers for TrueNAS

.dockerignore

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+# Allow only build inputs. Never send saved games, credentials or Git history.
+**
+!package.json
+!package-lock.json
+!tsconfig.json
+!next.config.ts
+!vite.config.ts
+!.oxlintrc.json
+!components.json
+!drizzle.config.ts
+!README.md
+!AGENTS.md
+!THIRD_PARTY_NOTICES.md
+!docs/**
+!.openai/
+!.openai/hosting.json
+!app/**
+!components/**
+!db/**
+!drizzle/**
+!game/**
+!hooks/**
+!lib/**
+!public/**
+!tests/**
+!tools/**
+!deploy/container-entrypoint.sh
+!deploy/serve.mjs
+**/*.orig
+**/*.rej
+**/.env*
+**/.dev.vars*
+**/*.sqlite*
+**/*.pem