Add OIDC Session Management component and Docker development setup

Implement OpenID Connect Session Management 1.0 specification in the test Relying Party application with a new SessionMonitor Svelte component that:

- Monitors authentication session state using the OIDC provider's check_session_iframe endpoint
- Periodically checks session status every 5 seconds via postMessage communication with hidden iframe
- Detects session changes (e.g., logout in another tab) and alerts users in real-time
- Displays comprehensive session information including session state, client ID, monitoring status, and last check time
- Handles discovery document fetching and validates provider support for session management
- Provides detailed UI feedback for various states (authenticated, discovery errors, unsupported providers, missing session state)

Enhance Docker development environment with:

- Multi-stage Dockerfile using Node 22 and pnpm for development
- docker-compose.yml setup with Cloudflare tunnel service for public URL access
- Environment variable configuration for PUBLIC_HOST to support public deployments
- Vite server configuration to allow configurable hosts for development

Update environment configuration to support public hosting scenarios and remove debug logging from layout component.

Author: lullis

tests/app/rp/.env.example

@@ -1,3 +1,6 @@
+# Set this if you want to run this on a public URL
+# PUBLIC_HOST=localhost
+
 # OAuth Configuration
 # OIDC Issuer URL (Identity Provider endpoint)
 PUBLIC_OIDC_ISSUER=http://localhost:8000/o

tests/app/rp/Dockerfile

@@ -1,16 +1,23 @@
-FROM node:18-alpine AS builder
+FROM node:22-alpine AS base
 WORKDIR /app
 COPY package*.json .
+
+
+FROM base AS builder
 RUN npm ci
 COPY . .
 RUN npm run build
 RUN npm prune --production
 
-FROM node:18-alpine
+FROM node:22-alpine
 WORKDIR /app
 COPY --from=builder /app/build build/
 COPY --from=builder /app/node_modules node_modules/
 COPY package.json .
 EXPOSE 3000
 ENV NODE_ENV=production
-CMD [ "node", "build" ]
+CMD [ "node", "build" ]
+
+FROM base AS dev
+RUN npm install -g pnpm
+RUN pnpm install

tests/app/rp/docker-compose.yml

@@ -0,0 +1,35 @@
+services:
+  cloudflared:
+    image: cloudflare/cloudflared
+    user: root:root
+    command: tunnel run ${APP_CLOUDFLARE_TUNNEL_ID}
+    networks:
+      - default
+      - internal
+
+    environment:
+      TUNNEL_TOKEN: ${APP_CLOUDFLARE_TUNNEL_TOKEN}
+
+  frontend:
+    user: "${UID:-1000}:${GID:-1000}"
+    build:
+      context: ./
+      target: dev
+    restart: unless-stopped
+    networks:
+      - internal
+    command: pnpm run dev --host
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:5173"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+    volumes:
+      - "./:/app"
+
+    env_file:
+      - .env
+
+networks:
+  internal: