Add sample upstream provider

sample_upstream_provider/dex-provider/dex.config.yaml

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+issuer: http://127.0.0.1:9001/dex
+
+storage:
+  type: memory
+
+web:
+  http: 0.0.0.0:9001
+
+oauth2:
+  # Automate some clicking
+  # Note: this might actually make some tests pass that otherwise wouldn't.
+  skipApprovalScreen: false
+
+connectors:
+  # Note: this might actually make some tests pass that otherwise wouldn't.
+  - type: mockCallback
+    id: mock
+    name: Example
+
+# Basic OP test suite requires two clients.
+staticClients:
+  - id: foo
+    secret: bar
+    redirectURIs:
+      - http://localhost:8000/prov_cb
+    name: Auth

sample_upstream_provider/docker-compose.yaml

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+services:
+  upstream:
+    image: dexidp/dex
+    user: "1000"
+    network_mode: host
+    volumes:
+      - ./dex-provider:/conf:ro
+    command: [ "dex", "serve", "/conf/dex.config.yaml" ]
+
+  client1:
+    image: pierre42100/oidc_test_client
+    user: "1000"
+    network_mode: host
+    environment:
+      - LISTEN_ADDR=0.0.0.0:8011
+      - PUBLIC_URL=http://127.0.0.1:8011
+      - CONFIGURATION_URL=http://localhost:8000/.well-known/openid-configuration
+      - CLIENT_ID=testclient1
+      - CLIENT_SECRET=secretone
+
+  client2:
+    image: pierre42100/oidc_test_client
+    user: "1000"
+    network_mode: host
+    environment:
+      - LISTEN_ADDR=0.0.0.0:8012
+      - PUBLIC_URL=http://127.0.0.1:8012
+      - CONFIGURATION_URL=http://localhost:8000/.well-known/openid-configuration
+      - CLIENT_ID=testclient2
+      - CLIENT_SECRET=secrettwo
+
+  basicoidc:
+    image: rust
+    user: "1000"
+    network_mode: host
+    environment:
+      - STORAGE_PATH=/storage
+      #- RUST_LOG=debug
+    volumes:
+      - ../:/app
+      - ./storage:/storage
+      - ~/.cargo/registry:/usr/local/cargo/registry
+    command:
+      - bash
+      - -c
+      - cd /app && cargo run