added a draft for docker usage

.dockerignore

@@ -0,0 +1,3 @@
+config
+Dockerfile
+example.env

Dockerfile

@@ -0,0 +1,11 @@
+FROM node:16-alpine
+
+WORKDIR /usr/src/app
+
+COPY package*.json ./
+
+RUN npm install
+
+COPY . .
+
+CMD [ "node", "index.js"]

README.md

@@ -3,11 +3,15 @@
 1. Update the self description in `self-description.json`.
 2. Create a new `.env` file with `PRIVATE_KEY`, `CERTIFICATE`, `VERIFICATION_METHOD` and `X5U_URL` as properties. 
 3. Install dependencies `npm i` and execute the script `node index.js` (node@16 or higher required).
+    - Alternatively, the script can be run with docker
+        1. Build the container with `docker build -t self-description-signer .`
+        2. Run the script with `docker run -it --mount src="$(pwd)/config",target=/usr/src/app/config,type=bind self-description-signer`
 4. The given self description will be locally signed and a new file containing self description + proof called `timestamp_self-signed_gx-type.json` will be created.
 5. In addition, a did.json will be created based on the provided `CERTIFICATE` and `VERIFICATION_METHOD`
 6. Upload this did.json to your domain (e.g. `https://your_domain.com/.well-known/did.json`).
 7. Re-run the script and finally, the compliance service is used to sign the locally signed self description. It signs it if the final result is against the compliance service. The result is stored in a new file called `timestamp_complete_gx-type.json`
 
+
 ## How it Works
 1. The given Self Description is canonized with [URDNA2015](https://json-ld.github.io/rdf-dataset-canonicalization/spec/)
 2. Next the canonized output is hashed with [SHA256](https://json-ld.github.io/rdf-dataset-canonicalization/spec/#dfn-hash-algorithm).

index.js

@@ -1,11 +1,13 @@
-require('dotenv').config()
+const conf = './config/'
+
+require('dotenv').config({path:conf + '.env'})
 
 const axios = require('axios')
 const crypto = require('crypto')
 const fs = require('fs').promises
 const jose = require('jose')
 
-const { selfDescription } = require('./self-description.json')
+const { selfDescription } = require(conf+'/self-description.json')
 const currentTime = new Date().getTime()
 const BASE_URL = "https://compliance.lab.gaia-x.eu"
 
@@ -64,7 +66,7 @@ async function createSignedSdFile(selfDescription, proof) {
   const status = proof ? "self-signed" : "complete"
   const type = proof ? selfDescription['@type'].split(':')[0] : selfDescription.selfDescriptionCredential.selfDescription['@type'].split(':')[0]
   const data = JSON.stringify(content, null, 2)
-  const filename = `${currentTime}_${status}_${type}.json`
+  const filename = conf+`${currentTime}_${status}_${type}.json`
 
   await fs.writeFile(filename, data)
 
@@ -92,7 +94,7 @@ async function createDIDFile() {
   }
 
   const data = JSON.stringify(did, null, 2)
-  const filename = `${currentTime}_did.json`
+  const filename = conf + `${currentTime}_did.json`
 
   await fs.writeFile(filename, data)