Add docker support

.dockerignore

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+node_modules
+npm-debug.log

Dockerfile

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+FROM node:10 AS ui-build
+WORKDIR /usr/src/
+COPY app/ ./app/
+RUN cd app && yarn install && yarn run build
+
+FROM node:10 AS server-build
+WORKDIR /root/
+COPY --from=ui-build /usr/src/app/dist ./app/dist
+# Take advantage of cached Docker layers
+COPY server/package.json ./server/
+COPY server/yarn.lock ./server/
+RUN cd server && yarn install
+
+COPY server/ ./server/
+
+EXPOSE 3080
+
+CMD ["node", "./server/server.js"]

docker-compose.yml

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+version: "3.8"
+services: 
+  quelea_web:
+    container_name: quelea_web
+    build: 
+      context: .
+      dockerfile: Dockerfile
+    ports: 
+      - 3000:3000