Add flowagent secrets reference doc (placeholders only, no real values)

Documents the Pattern C secrets needed once mcpo/config.json + ai.yaml are
updated in a follow-up PR to actually wire FlowAgent into the mcpo service.

mcpo/flowagent/Dockerfile

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+FROM ghcr.io/open-webui/mcpo:main
+
+# Azure CLI — required for non-interactive service-principal auth
+# (`az login --service-principal`) performed by entrypoint.sh at container
+# start. FlowAgent's auth model is Azure CLI + MSAL; see
+# https://github.com/microsoft/power-platform-skills/blob/main/plugins/power-automate/references/connection-patterns.md
+RUN apk add --no-cache py3-pip curl \
+ && pip install --no-cache-dir --break-system-packages azure-cli
+
+# FlowAgent self-contained MCP bundle (stdio transport, all tools inlined,
+# Node 18+ only — no npm install / remote host needed at runtime).
+# Pinned to a ref (commit SHA or tag), NOT `main`, for reproducible builds.
+# Bump deliberately via PR when upstream ships updates:
+# https://github.com/microsoft/power-platform-skills/tree/main/plugins/power-automate/server
+ARG FLOWAGENT_REF=main
+RUN mkdir -p /app/flowagent \
+ && curl -fsSL "https://raw.githubusercontent.com/microsoft/power-platform-skills/${FLOWAGENT_REF}/plugins/power-automate/server/mcp.mjs" \
+      -o /app/flowagent/mcp.mjs
+
+COPY entrypoint.sh /app/flowagent/entrypoint.sh
+RUN chmod +x /app/flowagent/entrypoint.sh

mcpo/flowagent/entrypoint.sh

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+#!/bin/sh
+# FlowAgent MCP entrypoint — non-interactive Azure service-principal login.
+#
+# Expects three env vars pointing at Docker secret files (Pattern C,
+# _FILE convention, provisioned by Woodpecker — never hand-typed):
+#   FLOWAGENT_AZURE_CLIENT_ID_FILE
+#   FLOWAGENT_AZURE_TENANT_ID_FILE
+#   FLOWAGENT_AZURE_CLIENT_SECRET_FILE
+#
+# On success, execs into the real command (node /app/flowagent/mcp.mjs),
+# replacing this shell so mcpo's stdio pipe talks directly to the MCP process.
+set -eu
+
+: "${FLOWAGENT_AZURE_CLIENT_ID_FILE:?FLOWAGENT_AZURE_CLIENT_ID_FILE not set}"
+: "${FLOWAGENT_AZURE_TENANT_ID_FILE:?FLOWAGENT_AZURE_TENANT_ID_FILE not set}"
+: "${FLOWAGENT_AZURE_CLIENT_SECRET_FILE:?FLOWAGENT_AZURE_CLIENT_SECRET_FILE not set}"
+
+CLIENT_ID="$(cat "$FLOWAGENT_AZURE_CLIENT_ID_FILE")"
+TENANT_ID="$(cat "$FLOWAGENT_AZURE_TENANT_ID_FILE")"
+CLIENT_SECRET="$(cat "$FLOWAGENT_AZURE_CLIENT_SECRET_FILE")"
+
+az login --service-principal \
+  -u "$CLIENT_ID" \
+  -p "$CLIENT_SECRET" \
+  --tenant "$TENANT_ID" \
+  --output none
+
+unset CLIENT_SECRET
+
+exec "$@"

secrets/flowagent.secrets.example

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+# flowagent (Power Automate MCP, via mcpo service) — Secrets Reference
+# Source: mcpo/flowagent — built into a custom image, consumed by the
+# "mcpo" service in ai.yaml (NEVER mcpo-critical).
+#
+# Add SECRET values to Woodpecker at:
+#   https://woodpecker.bryanmail.net
+#   homelab/compose-files → Settings → Secrets
+#
+# Prerequisite (manual, outside GitOps — Azure Portal):
+#   1. Entra ID → App registrations → New registration
+#      Name: flowagent-mcp-homelab, single tenant
+#   2. API permissions → add Power Automate / Flow Service application
+#      permissions + Dynamics CRM user_impersonation (Dataverse access)
+#   3. Grant admin consent
+#   4. Certificates & secrets → new client secret → copy value immediately
+#   5. Power Platform Admin Center → target environment → S2S apps →
+#      register the application user for this app ID (required for
+#      Dataverse/environment access by a service principal)
+#
+# NOTE: the OLD "powerautomate" mcpo/config.json entry (npm package
+# powerautomate-mcp, client_id 84b431ed-..., tenant_id 0f6cf991-...) was
+# never onboarded to this secrets pipeline and is being replaced by this.
+# Do not reuse those IDs unless you've independently confirmed in Azure
+# Portal that the old App Registration still exists, still has valid
+# permissions/consent, and you intend to reuse it — otherwise register new.
+
+# ── SECRETS (add to Woodpecker) ──────────────────────────────────────────
+
+# Woodpecker secret name:  flowagent_azure_client_id
+# Used for:                Azure AD App Registration client ID
+# Env var in entrypoint:   FLOWAGENT_AZURE_CLIENT_ID_FILE (Docker secret _FILE)
+flowagent_azure_client_id=
+
+# Woodpecker secret name:  flowagent_azure_tenant_id
+# Used for:                Azure AD tenant ID
+# Env var in entrypoint:   FLOWAGENT_AZURE_TENANT_ID_FILE (Docker secret _FILE)
+flowagent_azure_tenant_id=
+
+# Woodpecker secret name:  flowagent_azure_client_secret
+# Used for:                Azure AD App Registration client secret (rotate if leaked)
+# Env var in entrypoint:   FLOWAGENT_AZURE_CLIENT_SECRET_FILE (Docker secret _FILE)
+flowagent_azure_client_secret=
+
+# ── Woodpecker provision-secrets case entry ──────────────────────────────
+# Add this to the provision-secrets step in .woodpecker/deploy.yml
+# (separate follow-up PR — this file only documents it):
+#
+#   ai)
+#     ... existing ai-stack secret provisioning ...
+#     create_or_update_secret "flowagent_azure_client_id"     "$FLOWAGENT_AZURE_CLIENT_ID"
+#     create_or_update_secret "flowagent_azure_tenant_id"     "$FLOWAGENT_AZURE_TENANT_ID"
+#     create_or_update_secret "flowagent_azure_client_secret" "$FLOWAGENT_AZURE_CLIENT_SECRET"
+#     ;;