Add shared workflows

.github/workflows/codeql.yml

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+name: "CodeQL"
+
+on:
+  push:
+    branches: ["main"]
+    paths-ignore:
+      - "**.md"
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: ["main"]
+    paths-ignore:
+      - "**.md"
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      matrix:
+        # Add the language(s) you want to analyze here as an array of strings
+        # for example: ['javascript'] or ['python', 'javascript']
+        language: ["javascript"]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      # Initializes the CodeQL tools for scanning.
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v2
+        with:
+          languages: ${{ matrix.language }}
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v2
+        with:
+          category: "/language:${{matrix.language}}"

.github/workflows/idle.yml

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+# This workflow is hosted at: https://github.com/mdn/workflows/blob/main/.github/workflows/idle.yml
+# Docs for this workflow: https://github.com/mdn/workflows/blob/main/README.md#idle
+name: "Label idle issues"
+
+on:
+  schedule:
+    - cron: "0 8 * * *"
+
+jobs:
+  mark-as-idle:
+    uses: mdn/workflows/.github/workflows/idle.yml@main
+    with:
+      target-repo: "mdn/webextensions-examples"

.github/workflows/welcome-bot.yml

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+# This workflow is hosted at: https://github.com/mdn/workflows/blob/main/.github/workflows/allo-allo.yml
+# Docs for this workflow: https://github.com/mdn/workflows/blob/main/README.md#allo-allo
+name: "AlloAllo"
+
+on:
+  issues:
+    types:
+      - opened
+  pull_request_target:
+    branches:
+      - main
+    types:
+      - opened
+      - closed
+
+jobs:
+  allo-allo:
+    uses: mdn/workflows/.github/workflows/allo-allo.yml@main
+    with:
+      target-repo: "mdn/todo-vue"
+      issue-welcome: |
+        It looks like this is your first issue. Welcome! 👋
+        One of the project maintainers will be with you as soon as possible. We
+        appreciate your patience. To safeguard the health of the project, please
+        take a moment to read our [code of conduct](../blob/main/CODE_OF_CONDUCT.md).
+      pr-welcome: |
+        It looks like this is your first pull request. 🎉
+        Thank you for your contribution! One of the project maintainers will triage
+        and assign the pull request for review. We appreciate your patience. To
+        safeguard the health of the project, please take a moment to read our
+        [code of conduct](../blob/main/CODE_OF_CONDUCT.md).
+      pr-merged: |
+        Congratulations on your first merged pull request. 🎉 Thank you for your contribution!
+        Did you know we have a [project board](https://github.com/orgs/mdn/projects/25) with high-impact contribution opportunities?
+        We look forward to your next contribution.