Add an example for Node.js

examples/example_http_expressjs/.dockerignore

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+*.zip
+*.squashfs
+*.key

examples/example_http_expressjs/Dockerfile

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+FROM node:16-bullseye
+
+RUN apt-get update && apt-get -y upgrade && apt-get install -y \
+     libsecp256k1-dev \
+     squashfs-tools \
+     python3-pip \
+     git \
+     && rm -rf /var/lib/apt/lists/*
+
+RUN pip install aleph-client
+
+WORKDIR /usr/src/example_http_js
+COPY . .
+
+RUN npm i

examples/example_http_expressjs/Makefile

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+
+podman-prepare:
+	podman build -t aleph-example-js .
+
+podman-publish:
+	podman run --rm -ti aleph-example-js make publish
+
+podman-client:
+	podman rmi aleph-example-js
+
+docker-prepare:
+	docker build -t aleph-example-js .
+
+docker-publish:
+	docker run --rm -ti aleph-example-js make publish
+
+publish:
+	chmod +x ./src/run.sh
+	aleph program ./src "run.sh"

examples/example_http_expressjs/README.md

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+# Aleph VM JS Example
+
+A simple example program written in JS that can run in an Aleph VM.
+
+## About
+
+This example is a simple HTTP server listening on port 8080. 
+It does not depend on third-party libraries.
+
+Test it on http://localhost:8080.
+
+## Publish the program
+
+### Locally
+
+```shell
+make publish
+```
+
+### Using Podman
+
+```shell
+make podman-prepare
+make podman-publish
+```
+
+### Using Docker
+
+```shell
+make docker-prepare
+make docker-publish
+```