AP-25351: Add GitHub configuration files

* `workflows/ci.yml` - lint+test+build JS code + check Python format in CI
* `workflows/copilot-setup-steps.yml` - setup Copilot agent dev environment
* `dependabot.yml` - config for bumping dependencies
* `CODEOWNERS` - setting team Rakete as the code owners

AP-25351 (Add GitHub Actions for repositories containing scripting editors)

Author: HedgehogCode

.github/CODEOWNERS

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+* @knime/rakete

.github/dependabot.yml

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+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/org.knime.python3.scripting.nodes/js-src"
+    schedule:
+      interval: "weekly"
+      day: "sunday"
+      time: "18:00"
+    cooldown:
+      default-days: 5
+      exclude:
+        - "@knime/*"
+    groups:
+      knimeKds:
+        patterns:
+          - "@knime/kds-*"
+      vueuse:
+        patterns:
+          - "*vueuse*"
+      vitest:
+        patterns:
+          - "*vitest*"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "sunday"
+      time: "18:00"
+    cooldown:
+      default-days: 5

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - "releases/**"
+
+jobs:
+  python-format:
+    name: Python format
+    permissions:
+      contents: read
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: astral-sh/ruff-action@v3
+        with:
+          args: "format --check --diff"
+
+  js-lint-test-build:
+    name: JS lint, tests, and build
+    permissions:
+      contents: read
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: org.knime.python3.scripting.nodes/js-src
+    steps:
+      - uses: actions/checkout@v5
+      - name: Install Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: "22.11.0"
+          cache: "npm"
+          cache-dependency-path: org.knime.python3.scripting.nodes/js-src/package-lock.json
+      - name: Install dependencies
+        run: npm ci
+      - name: Type check
+        run: npm run type-check
+      - name: Lint and format check
+        run: npm run ci:lint-format
+      - name: Run coverage
+        run: npm run coverage
+      - name: Audit
+        run: npm run audit
+      - name: Build
+        run: npm run build

.github/workflows/copilot-setup-steps.yml

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+name: "Copilot Setup Steps"
+
+# Automatically run the setup steps when they are changed to allow for easy validation, and
+# allow manual testing through the repository's "Actions" tab
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+  pull_request:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+
+jobs:
+  # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    defaults:
+      run:
+        working-directory: org.knime.python3.scripting.nodes/js-src
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Install Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: "22.11.0"
+          cache: "npm"
+          cache-dependency-path: org.knime.python3.scripting.nodes/js-src/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci