ruby: add docker files

web/documentserver-example/ruby/Dockerfile

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+FROM ruby:3.2.2-alpine3.18 AS example-base
+WORKDIR /srv
+COPY . .
+RUN \
+	apk update && \
+	apk add --no-cache \
+		build-base \
+		gcompat \
+		git \
+		make \
+		nodejs && \
+	gem install bundler -v 2.3.7
+
+FROM example-base AS example-dev
+RUN make dev
+CMD ["make", "server-dev"]
+
+FROM example-base AS example-prod
+RUN make prod
+CMD ["make", "server-prod"]
+
+FROM nginx:1.23.4-alpine3.17 AS proxy
+COPY proxy/nginx.conf /etc/nginx/nginx.conf

web/documentserver-example/ruby/compose-base.yml

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+version: "3.8"
+
+services:
+  document-server:
+    container_name: document-server
+    image: onlyoffice/documentserver:7.3.3.50
+    expose:
+      - "80"
+    environment:
+      - JWT_SECRET=your-256-bit-secret
+
+  example:
+    container_name: example
+    build:
+      context: .
+      target: example
+    expose:
+      - "80"
+    environment:
+      - BINDING=0.0.0.0
+      - DOCUMENT_SERVER_URL=http://localhost:8080
+      - EXAMPLE_URL=http://proxy
+      - JWT_SECRET=your-256-bit-secret
+      - PORT=80
+
+  proxy:
+    container_name: proxy
+    build:
+      context: .
+      target: proxy
+    ports:
+      - "80:80"
+      - "8080:8080"

web/documentserver-example/ruby/compose-dev.yml

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+version: "3.8"
+
+services:
+  example:
+    build:
+      target: example-dev

web/documentserver-example/ruby/compose-prod.yml

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+version: "3.8"
+
+services:
+  example:
+    build:
+      target: example-prod

web/documentserver-example/ruby/proxy/nginx.conf

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+worker_processes auto;
+
+events {
+	worker_connections 512;
+}
+
+http {
+	include /etc/nginx/mime.types;
+
+	server {
+		listen 80;
+		server_name localhost;
+
+		location / {
+			proxy_http_version 1.1;
+			proxy_pass http://example;
+		}
+	}
+
+	server {
+		listen 8080;
+		server_name localhost;
+
+		location / {
+			client_max_body_size 100m;
+			proxy_http_version 1.1;
+			proxy_pass http://document-server;
+			proxy_redirect off;
+			proxy_set_header Connection "upgrade";
+			proxy_set_header Host $http_host;
+			proxy_set_header Upgrade $http_upgrade;
+			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+			proxy_set_header X-Forwarded-Host $http_x_forwarded_host;
+			proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;
+			proxy_set_header X-Real-IP $remote_addr;
+		}
+	}
+}