fix alpha config example

contrib/local-environment/oauth2-proxy-alpha-config.cfg

@@ -1,5 +1,4 @@
-http_address="0.0.0.0:4180"
 cookie_secret="OQINaROshtE9TcZkNAm-5Zs2Pv3xaWytBmc5W7sPX7w="
 email_domains="example.com"
 cookie_secure="false"
-redirect_url="http://localhost:4180/oauth2/callback"
+redirect_url="http://oauth2-proxy.localtest.me:4180/oauth2/callback"

contrib/local-environment/oauth2-proxy-alpha-config.yaml

@@ -1,23 +1,31 @@
-upstreams:
-  - id: httpbin
-    path: /
-    uri: http://httpbin
+server:
+  bindAddress: "0.0.0.0:4180"
+upstreamConfig:
+  upstreams:
+    - id: httpbin
+      path: /
+      uri: http://httpbin.localtest.me:8080
 injectRequestHeaders:
-- name: X-Forwarded-Groups
-  values:
-  - claim: groups
-- name: X-Forwarded-User
-  values:
-  -   claim: user
-- name: X-Forwarded-Email
-  values:
-  - claim: email
-- name: X-Forwarded-Preferred-Username
-  values:
-  - claim: preferred_username
+  - name: X-Forwarded-Groups
+    values:
+      - claimSource:
+          claim: groups
+  - name: X-Forwarded-User
+    values:
+      - claimSource:
+          claim: user
+  - name: X-Forwarded-Email
+    values:
+      - claimSource:
+          claim: email
+  - name: X-Forwarded-Preferred-Username
+    values:
+      - claimSource:
+          claim: preferred_username
 providers:
-- provider: oidc
-  clientSecret: b2F1dGgyLXByb3h5LWNsaWVudC1zZWNyZXQK
-  clientID: oauth2-proxy
-  oidcConfig:
-    issuerURL: http://dex.localhost:5556/dex
+  - id: oidc
+    provider: oidc
+    clientSecret: b2F1dGgyLXByb3h5LWNsaWVudC1zZWNyZXQK
+    clientID: oauth2-proxy
+    oidcConfig:
+      issuerURL: http://dex.localhost:5556/dex