Initial gitea-mcpo-docker image

Wraps the official gitea-mcp server (binary copied from
docker.gitea.com/gitea-mcp-server:1.7.0) and serves it two ways from one
container:

- :8000 mcpo (OpenAPI) for Open WebUI, using the container's service
  token and guarded by MCPO_API_KEY.
- :8080 native streamable-HTTP MCP at /mcp for coding agents, with the
  service token stripped so each client must send its own Gitea token.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,47 @@
+# syntax=docker/dockerfile:1
+
+# Pinned release of the official Gitea MCP server
+# (https://gitea.com/gitea/gitea-mcp), taken from its published image rather
+# than built from source. Note the registry's tags have no "v" prefix. Bump
+# by checking the new release's `gitea-mcp --help` still accepts the flags
+# and env vars entrypoint.sh relies on (-t stdio|http, -p, GITEA_HOST,
+# GITEA_ACCESS_TOKEN[_FILE], MCP_MODE).
+ARG GITEA_MCP_VERSION=1.7.0
+
+# Pinned mcpo release (PyPI). Bump by checking the new version's CLI flags
+# still match what entrypoint.sh assumes (--host/--port/--api-key/--).
+ARG MCPO_VERSION=0.0.20
+
+# mcpo's own pyproject.toml only requires "mcp>=1.17.0" (unbounded), but its
+# lockfile shows it's built/tested against exactly this version. Pinning it
+# ourselves avoids pip resolving a newer mcp SDK release whose API mcpo
+# doesn't yet support (observed: mcp 2.2.0 renamed an import mcpo 0.0.20
+# depends on, breaking startup). When bumping MCPO_VERSION, check the new
+# release's uv.lock for its actual tested "mcp" version and update this too.
+ARG MCP_SDK_VERSION=1.17.0
+
+FROM docker.gitea.com/gitea-mcp-server:${GITEA_MCP_VERSION} AS gitea-mcp
+
+FROM python:3.12-slim-bookworm
+ARG MCPO_VERSION
+ARG MCP_SDK_VERSION
+
+# tini as PID 1: entrypoint.sh supervises two long-running processes, so
+# something needs to reap zombies and deliver signals properly.
+RUN apt-get update && apt-get install -y --no-install-recommends tini \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN pip install --no-cache-dir "mcpo==${MCPO_VERSION}" "mcp==${MCP_SDK_VERSION}"
+
+# gitea-mcp is a static Go binary (CGO_ENABLED=0), so it runs fine outside
+# its distroless origin image.
+COPY --from=gitea-mcp /app/gitea-mcp /usr/local/bin/gitea-mcp
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+RUN useradd --system --no-create-home --shell /usr/sbin/nologin app
+USER app
+
+EXPOSE 8000 8080
+ENTRYPOINT ["tini", "--", "/entrypoint.sh"]