build: add Dockerfile

.dockerignore

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+*.iml
+gen
+.idea
+*.md
+.gitignore

.github/workflows/ci.yml

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+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  package:
+    name: Build container images
+    runs-on: ubuntu-22.04
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v3
+      - uses: docker/setup-qemu-action@v2
+      - uses: docker/setup-buildx-action@v2
+      - uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/metadata-action@v4
+        id: meta
+        with:
+          images: ghcr.io/${{ github.repository }}
+      - uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: true
+          file: Dockerfile
+          platforms: linux/amd64, linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+FROM golang:1.19 as build
+WORKDIR /build
+COPY . .
+RUN go build -o alpha main.go
+
+FROM scratch
+COPY --from=build /build/alpha ./alpha
+ENTRYPOINT ["alpha"]

docs/functions/node.md

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+# Create an Alpha-compliant Node.js function
+
+This guide will help you to set up your first Node.js function and execute it through Alpha.
+
+## Requirements
+
+- **Git repository** to host your function code (or similar, you will simply need something where you can store files and download them)
+
+## Create the function
+
+Once you've cloned / created your git repository, open it locally into your favourite code editor, and create an **index.js** file inside with the following placeholder content :
+
+> **The name of the file must be exactly `index.js`**.
+
+```javascript
+exports.handler = function (ctx, params) {
+  ctx.logger.log("Hello from my first JS function !")
+
+  let name = params["name"] || "world";
+  return { message: `Hello ${name} !`};
+};
+```
+
+- First, we export a function called **handler**. The name, like the file name, is important and can't be changed for now.
+- Your function takes 2 parameters : `ctx` and `params`. `ctx` is an object provided by the runtime that contains helpers like logger. `params` is simply a Javascript object that contains the variables given to the function. 
+- The `return` statement at the end MUST return a valid JSON object representation.
+