Add docker image

.dockerignore

@@ -0,0 +1,2 @@
+node_modules/
+docs/

README.md

@@ -220,5 +220,27 @@ app.use(router.allowedMethods());
 app.listen(3001);
 ```
 
+## Docker image
+
+### Build
+
+```
+$ yarn install
+$ yarn run build:release
+```
+
+```
+$ docker build . -f docker-image/Dockerfile -t apisguru/graphql-voyager
+$ docker push apisguru/graphql-voyager
+```
+
+### Configuration
+
+You can config docker image with environment variable
+
+- `PORT` to change listen port
+- `GRAPHQL_ENDPOINT` address of graphql API
+- `HEADER` headers to add to request, formated as 'header1=value1&header2=value2'
+
 ## Credits
 This tool is inspired by [graphql-visualizer](https://github.com/NathanRSmith/graphql-visualizer) project.

docker-image/Dockerfile

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+FROM node:11.14.0-alpine
+
+RUN apk add \
+    ca-certificates \
+    musl-dev 
+
+ADD dist/ /graphql-voyager/dist/
+ADD middleware/ /graphql-voyager/middleware/
+ADD src/ /graphql-voyager/src/
+ADD package.json /graphql-voyager/package.json
+ADD docker-image/package.json /graphql-voyager/docker-image/package.json
+ADD docker-image/package-lock.json /graphql-voyager/docker-image/package-lock.json
+
+RUN npm install
+
+ADD docker-image/index.js /graphql-voyager/docker-image/index.js
+
+WORKDIR /graphql-voyager/
+
+WORKDIR /graphql-voyager/docker-image/
+
+RUN npm install
+
+ENV PORT=3001
+
+CMD node index.js

docker-image/index.js

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+const express = require('express');
+const voyager = require('graphql-voyager/middleware');
+
+const app = express();
+
+const headersJS = (() => {
+  if (!process.env.HEADERS || typeof process.env.HEADERS !== 'string') {
+    return JSON.stringify({});
+  };
+  const headers = {};
+
+  process.env.HEADERS.split('&').forEach(header => {
+      let headerSplit = header.split('=');
+
+    if (headerSplit.length === 2) {
+        headers[headerSplit[0]] = headerSplit[1];
+      }
+  });
+  return JSON.stringify(headers);
+})()
+
+app.use('/', voyager.express({
+  endpointUrl: process.env.GRAPHQL_ENDPOINT,
+  headersJS: headersJS
+}));
+
+process.on('SIGINT', function () {
+  console.log("\nGracefully shutting down from SIGINT (Ctrl-C)");
+  process.exit(1);
+});
+
+const port = process.env.PORT;
+
+app.listen(port, function(err) {
+  if (err) {
+      throw new Error(
+          `Failed to start listening on ${port}, error: ${err.message}`
+      );
+  }
+  console.log(`listening on http://0.0.0.0:${port}`);
+});