fix: Unable to push image on non 80 port

resolves: #88

examples/issue-88/README.md

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+# Example for issue #88
+
+When the docker registry ui is used as a proxy and its port is not 80, we can't push images.
+To fix that, I added the correct Host header in the proxy_set_header.

examples/issue-88/config.yml

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+version: 0.1
+log:
+  fields:
+    service: registry
+storage:
+  cache:
+    blobdescriptor: inmemory
+  filesystem:
+    rootdirectory: /var/lib/registry
+  delete:
+    enabled: true
+http:
+  addr: :5000
+  headers:
+    X-Content-Type-Options: [nosniff]
+    Access-Control-Allow-Origin: ['*']
+    Access-Control-Allow-Methods: ['HEAD', 'GET', 'OPTIONS', 'DELETE']
+    Access-Control-Expose-Headers: ['Docker-Content-Digest']
+health:
+  storagedriver:
+    enabled: true
+    interval: 10s
+    threshold: 3

examples/issue-88/docker-compose.yml

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+version: '2'
+
+services:
+  registry-srv:
+    image: registry:latest
+    restart: always
+    volumes:
+      - storage:/var/lib/registry
+      - ./config.yml:/etc/docker/registry/config.yml:ro
+    networks:
+      - registry-ui-net
+    container_name: registry-srv
+
+  registry-ui:
+    image: joxit/docker-registry-ui:static
+    restart: always
+    ports:
+      - 8080:80
+    environment:
+      - REGISTRY_TITLE=Private Docker Registry
+      - REGISTRY_URL=http://registry-srv:5000
+      - DELETE_IMAGES=true
+    depends_on:
+      - debugproxy
+    networks:
+      - registry-ui-net
+    container_name: registry-ui
+
+networks:
+    registry-ui-net:
+
+volumes:
+    storage:
+      driver: local