docs(docker): example how to run in alpine docker image

examples/docker/.dockerignore

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+node_modules

examples/docker/Dockerfile

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+FROM node:20.9.0-alpine3.18
+
+RUN apk update && apk add --no-cache make g++ python3 ghostscript graphicsmagick ghostscript-fonts
+
+WORKDIR /worker
+COPY . /worker
+
+RUN npm install
+
+CMD node index.mjs

examples/docker/README.md

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+# Example Docker alpine
+
+Build the image:
+```shell
+docker build -t pdf2pic-docker .
+```
+
+Run the container:
+```shell
+docker run pdf2pic-docker
+```

examples/docker/index.mjs

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+import { fromBuffer } from 'pdf2pic';
+import fs from 'fs/promises'
+
+const pdfBuffer = await fs.readFile('example.pdf');
+const convert = fromBuffer(pdfBuffer, { width: 1024, preserveAspectRatio: true });
+const result = await convert(1, { responseType: 'buffer' });
+
+console.log(result);
+
+await fs.writeFile('page_1.png', result.buffer, 'binary');

examples/docker/package.json

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+{
+  "name": "example-docker",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.mjs",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "pdf2pic": "^3.1.1"
+  }
+}