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Upstream docker.gitea.com/gitea-mcp-server is distroless — `Cmd` is ["/app/gitea-mcp"] and there is no /bin/sh at any path (verified by exec'ing every candidate against the running pod). That is fine until the server wants secretDelivery: injector. The OpenBao agent renders secrets to a FILE, so mcpd wraps the container command as `sh -c '. /vault/secrets/<name>; exec "$0" "$@"'`, which needs a shell. gitea was the only server in the fleet blocked on this, and so the only one whose token had to stay inline in its pod spec. Copying one static Go binary onto debian:stable-slim is cheaper than building and maintaining a static envexec shim, and follows the precedent in deploy/Dockerfile.docmost-mcp — this repo already rebuilds third-party MCP servers when it needs to change how they run. ca-certificates is required rather than incidental: the binary talks HTTPS to mysources.co.uk and the distroless base shipped a trust store we are leaving behind. Verified in the built image: shell present, binary runs, ca-certificates.crt present. ENTRYPOINT is kept so the plain (non-injected) path behaves exactly like upstream; mcpd replaces it with the sourcing wrapper only when the server opts in. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vybEitX4FykeMatKe5Xki
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