[Javascript] Set up CI workflow

.github/workflows/javascript.yml

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+name: javascript
+
+on:
+  push:
+    paths:
+      - ".github/workflows/javascript.yml"
+      - "javascript/**"
+    branches: [main]
+  pull_request:
+    paths:
+      - ".github/workflows/javascript.yml"
+      - "javascript/**"
+    branches: [main]
+
+defaults:
+  run:
+    working-directory: javascript
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18.x
+      - name: Install dependencies
+        run: yarn
+      - name: Run tests
+        run: yarn workspaces run test

javascript/.gitignore

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+node_modules

javascript/package.json

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+{
+  "name": "exercism-javascript-workspace",
+  "version": "0.0.0",
+  "private": true,
+  "workspaces": [
+    "annalyns-infiltration",
+    "freelancer-rates",
+    "hello-world",
+    "lasagna"
+  ]
+}

javascript/yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+