chore: add scale test package

In addition, add github workflow for releasing the scale test docker
images which is a prerequisite for the scale test.

.github/workflows/scale-test-docker-release.yml

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+name: Build and Push Scale Test Docker Image
+on:
+  push:
+    paths:
+      - 'packages/**'
+      - 'tests/scaling/**'
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        roles: [node, relay]
+
+    name: Build and Push Scale Test Docker Image
+    permissions: write-all
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout the Code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Login to Docker Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: rosen-bridge
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker Metadata action
+        uses: docker/metadata-action@v5
+        id: meta
+        tags: latest
+        with:
+          images: ghcr.io/rosen-bridge/scale-test${{matrix.role}}
+
+      - name: Build and push ${{matrix.role}}
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: 'tests/scaling/src/${{matrix.role}}/Dockerfile'
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}

tests/scaling/.eslintignore

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+dist

tests/scaling/README.md

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+# RoseNet scaling test
+
+## Table of contents
+
+- [Introduction](#introduction)
+- [Usage](#usage)
+
+## Introduction
+
+RoseNet scaling test
+
+## Usage
+
+You need to have [OpenTofu](https://opentofu.org/) installed. Then, after
+[passing required variables](https://opentofu.org/docs/language/values/variables/#assigning-values-to-root-module-variables) (defined in [`variables.tf`](./variables.tf)),
+run the following commands. It should complete with no errors.
+
+```bash
+tofu init
+tofu apply
+```
+
+Finally run `tofu destroy` to destroy the infrastructure.