ci: single Gitea Actions pipeline, uv-based image, scoped docker cleanup

Replace lint/test/docker workflows with ci.yml (gitleaks, lint, test-unit, test-integration, test-mcp, build-and-push, docs-check, security). Rebuild the Dockerfile as a digest-pinned multi-stage uv build running as uid 1000, add .dockerignore, a hardened compose file and a gitleaks config. The integration harness now falls back to /etc/hostname and /proc/self to find its own container.

docker/Dockerfile

@@ -1,51 +1,68 @@
 # syntax=docker/dockerfile:1
 
-# Build stage
-FROM python:3.12-slim AS builder
+# Both stages use the same python:3.12-slim image, pinned by digest so a build
+# is reproducible. Refresh the digest deliberately (docker pull, then
+# docker inspect --format '{{index .RepoDigests 0}}' python:3.12-slim).
+ARG PYTHON_IMAGE=python:3.12-slim@sha256:a6e34c598f2467ed0e9a8d349809fcd8b5c603269512df273a0bb1784edc11b1
+ARG UV_IMAGE=ghcr.io/astral-sh/uv:0.12.5@sha256:e85be844203885286c60ffad8a858d48afb6c5a5c237ca0e67f12e74b8f174b1
 
-ENV PYTHONDONTWRITEBYTECODE=1
-ENV PYTHONUNBUFFERED=1
-ENV PIP_DISABLE_PIP_VERSION_CHECK=1
+FROM ${UV_IMAGE} AS uv
+
+# ---------------------------------------------------------------------------
+# Builder: resolve the locked, non-dev dependencies and install the project
+# (non-editable) into /app/.venv. Nothing from this stage except the venv is
+# copied into the runtime image.
+# ---------------------------------------------------------------------------
+FROM ${PYTHON_IMAGE} AS builder
+
+COPY --from=uv /uv /usr/local/bin/uv
+
+ENV UV_COMPILE_BYTECODE=1 \
+    UV_LINK_MODE=copy \
+    UV_PYTHON_DOWNLOADS=never \
+    UV_PROJECT_ENVIRONMENT=/app/.venv
 
 WORKDIR /app
 
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends gcc \
-    && rm -rf /var/lib/apt/lists/*
+COPY pyproject.toml uv.lock README.md LICENSE ./
+COPY src ./src
+RUN uv sync --locked --no-dev --no-editable
 
-COPY requirements.txt ./
-RUN pip install --no-cache-dir --user -r requirements.txt
+# ---------------------------------------------------------------------------
+# Runtime: slim image, only the venv, non-root user.
+# ---------------------------------------------------------------------------
+FROM ${PYTHON_IMAGE}
 
-# Runtime stage
-FROM python:3.12-slim
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PATH=/app/.venv/bin:$PATH
 
-ENV PYTHONDONTWRITEBYTECODE=1
-ENV PYTHONUNBUFFERED=1
-ENV PIP_DISABLE_PIP_VERSION_CHECK=1
-ENV NODE_ENV=production
-ENV ENVIRONMENT=production
-ENV PATH=/home/aegis/.local/bin:$PATH
-ENV PYTHONPATH=/app/src:$PYTHONPATH
+# Non-root runtime user (uid 1000). DATA_DIR holds the token store and the
+# audit log; mount a persistent volume there.
+RUN useradd --create-home --uid 1000 --shell /usr/sbin/nologin aegis \
+    && mkdir -p /var/lib/aegis-mcp \
+    && chown aegis:aegis /var/lib/aegis-mcp
 
-WORKDIR /app
+COPY --from=builder --chown=root:root /app/.venv /app/.venv
 
-# Non-root runtime user
-RUN useradd -m -u 1000 -s /usr/sbin/nologin aegis
-
-COPY --from=builder --chown=aegis:aegis /root/.local /home/aegis/.local
-COPY --chown=aegis:aegis src/ ./src/
-COPY --chown=aegis:aegis scripts/ ./scripts/
-
-# /var/log/aegis-mcp  -> audit log (mount a writable volume)
-# /var/lib/aegis-mcp  -> dynamic client registration store (mount a writable, persistent volume)
-RUN mkdir -p /var/log/aegis-mcp /var/lib/aegis-mcp /tmp/aegis-mcp \
-    && chown -R aegis:aegis /var/log/aegis-mcp /var/lib/aegis-mcp /tmp/aegis-mcp
+# Binding 0.0.0.0 is required for the published port to work inside a
+# container. It is safe by default: the server refuses to start (exit code 2)
+# on a non-loopback bind unless authentication is configured (MCP_BEARER_TOKEN
+# or OAUTH_ENABLED). Still publish the port only on 127.0.0.1 or behind a
+# reverse proxy (see docker-compose.yml).
+ENV DATA_DIR=/var/lib/aegis-mcp \
+    MCP_TRANSPORT=http \
+    MCP_HOST=0.0.0.0 \
+    MCP_PORT=8080
 
 USER aegis
+WORKDIR /home/aegis
 
 EXPOSE 8080
 
-HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
-  CMD python -c "import httpx; httpx.get('http://127.0.0.1:8080/health', timeout=5)" || exit 1
+# Python stdlib only (the slim image has no curl). Probes loopback on MCP_PORT.
+HEALTHCHECK --interval=30s --timeout=10s --start-period=15s --retries=3 \
+  CMD ["python", "-c", "import os, urllib.request; urllib.request.urlopen('http://127.0.0.1:%s/health' % os.environ.get('MCP_PORT', '8080'), timeout=5)"]
 
-CMD ["python", "-m", "aegis_gitea_mcp.server"]
+ENTRYPOINT ["aegis-gitea-mcp"]
+CMD ["serve"]