feat: add zroc-planner Python vCenter collector

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

zroc-planner/Dockerfile

@@ -0,0 +1,50 @@
+# ── Stage 1: dependency builder ───────────────────────────────────────────────
+FROM python:3.12-slim AS builder
+
+WORKDIR /build
+
+# Install build tools needed to compile pyvmomi's C extension if required
+RUN apt-get update -qq && apt-get install -y --no-install-recommends \
+        gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir --prefix=/install -r requirements.txt
+
+
+# ── Stage 2: runtime image ────────────────────────────────────────────────────
+FROM python:3.12-slim
+
+# Non-root user for security
+RUN groupadd -r collector && useradd -r -g collector collector
+
+WORKDIR /app
+
+# Copy installed packages from builder
+COPY --from=builder /install /usr/local
+
+# Copy application source
+COPY config.py collector.py server.py ./
+
+USER collector
+
+# Metrics port
+EXPOSE 9272
+
+# Health check — Docker will poll this every 30s
+HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
+    CMD python - <<'EOF'
+import urllib.request, sys
+try:
+    r = urllib.request.urlopen("http://localhost:9272/health", timeout=8)
+    import json
+    d = json.load(r)
+    sys.exit(0 if d.get("status") == "ok" else 1)
+except Exception:
+    sys.exit(1)
+EOF
+
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1
+
+ENTRYPOINT ["python", "server.py"]