Add quick exemple for issue #75

examples/issue-75/README.md

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+# Example for issue #75
+
+Run this command `docker-compose up -d`, then you can push your images (e.g localhost:5000/alpine).
+
+Be careful, the docker registry is using status codes 307 for each requests, that means you must configure your s3 to accept same requests as your private registry (that means `DELETE`, `Access-Control-Allow-Origin` and others).
+
+This s3 server allow all requests.

examples/issue-75/docker-compose.yml

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+version: '2.0'
+services:
+  registry:
+    image: registry:2.7
+    volumes:
+      - ./registry-data:/var/lib/registry
+      - ./registry-config/config.yml:/etc/docker/registry/config.yml
+    depends_on:
+      - s3-server
+    network_mode: host
+
+  ui:
+    image: joxit/docker-registry-ui:static
+    ports:
+      - 80:80
+    environment:
+      - URL=http://127.0.0.1:5000
+      - DELETE_IMAGES=true
+    depends_on:
+      - registry
+    network_mode: host
+
+  s3-server:
+    image: minio/minio:RELEASE.2019-04-09T01-22-30Z
+    volumes:
+      - ./s3-server-cmd:/bin/s3-server-cmd:ro
+    environment:
+      - MINIO_ACCESS_KEY=accessKey1
+      - MINIO_SECRET_KEY=verySecretKey1
+      - MINIO_REGION=us-east-1
+    network_mode: host
+    entrypoint: /bin/s3-server-cmd

examples/issue-75/registry-config/config.yml

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+version: 0.1
+
+log:
+  level: debug
+  fields:
+    service: registry
+storage:
+  delete:
+    enabled: true
+  cache:
+    blobdescriptor: inmemory
+  s3:
+    accesskey: accessKey1
+    secretkey: verySecretKey1
+    region: us-east-1
+    regionendpoint: http://127.0.0.1:9000
+    bucket: registry
+    encrypt: false
+    secure: false
+    v4auth: true
+    chunksize: 5242880
+    rootdirectory: /
+http:
+  addr: 0.0.0.0:5000
+  headers:
+    X-Content-Type-Options: [nosniff]
+    Access-Control-Allow-Origin: ['http://127.0.0.1']
+    Access-Control-Allow-Methods: ['HEAD', 'GET', 'OPTIONS', 'DELETE']
+    Access-Control-Allow-Headers: ['Authorization']
+    Access-Control-Max-Age: [1728000]
+    Access-Control-Allow-Credentials: [true]
+    Access-Control-Expose-Headers: ['Docker-Content-Digest']
+health:
+  storagedriver:
+    enabled: true
+    interval: 10s
+    threshold: 3

examples/issue-75/s3-server-cmd

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+#!/bin/sh
+
+set -e
+
+mkdir -p /data/registry
+minio server /data