feat: migrate several "verify-guides" workflow to Github actions

.github/actions/free-space/action.yml

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+name: Free disk space
+description: Frees some disk space on the runner.
+
+runs:
+  using: "composite"
+  steps:
+    - name: Remove Android library (~14GiB)
+      shell: bash
+      run: |
+        sudo rm -rf /usr/local/lib/android|| true
+
+    - name: Remove .Net runtime (~2.7GiB)
+      shell: bash
+      run: |
+        sudo rm -rf /usr/share/dotnet|| true
+
+    - name: Remove misc large packages (~5.3GiB)
+      shell: bash
+      run: |
+        sudo apt-get remove -yq --fix-missing --autoremove '^aspnetcore-.*'    || true
+        sudo apt-get remove -yq --fix-missing --autoremove '^dotnet-.*'       || true
+        sudo apt-get remove -yq --fix-missing --autoremove '^llvm-.*'         || true
+        sudo apt-get remove -yq --fix-missing --autoremove '^mongodb-.*'      || true
+        sudo apt-get remove -yq --fix-missing --autoremove '^google-cloud-*'   || true
+        sudo apt-get remove -yq --fix-missing --autoremove php-common php-pear|| true
+        sudo apt-get remove -yq --fix-missing --autoremove mysql-common       || true
+        sudo apt-get remove -yq --fix-missing --autoremove azure-cli powershell mono-devel libgl1-mesa-dri|| true
+        sudo apt-get remove -yq --fix-missing --autoremove google-chrome-stable firefox microsoft-edge-stable|| true
+        sudo apt-get remove -yq --fix-missing --autoremove snapd|| true
+        sudo apt-get autoremove -yq|| true
+        sudo apt-get clean|| true
+
+    - name: Remove Tool Cache (~5.9GiB)
+      shell: bash
+      run: |
+        sudo rm -rf "$AGENT_TOOLSDIRECTORY"|| true

.github/actions/install-deps/action.yml

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+name: "Setup Vespa CLI and dependencies"
+description: "Install Vespa CLI and dependencies"
+
+runs:
+  using: "composite"
+  steps:
+    # - name: Setup Ruby
+    #   uses: ruby/setup-ruby@v1
+    #   with:
+    #     ruby-version: 3.1
+    #     bundler-cache: true
+
+    - uses: actions/setup-java@v4
+      with:
+        distribution: "temurin"
+        java-version: "17"
+
+    - name: Install python dependencies
+      shell: bash
+      run: |
+        python3 -m pip install --upgrade pip
+        python3 -m pip install -qqq -r test/requirements.txt --user
+        python3 -m pip install -qqq pytest nbmake --user
+
+    - name: Install Vespa CLI
+      uses: vespa-engine/setup-vespa-cli-action@v1

.github/workflows/verify-guides-billion-vector.yml

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+name: Verify Giudes (billion scale vector search)
+
+on:
+  workflow_dispatch: # Allow manual triggering of this workflow.
+
+  push:
+    branches: ["master"]
+    paths:
+      - "billion-scale-vector-search/"
+
+  pull_request:
+    branches: ["master"]
+    paths:
+      - "billion-scale-vector-search/"
+
+jobs:
+  main:
+    uses: ./.github/workflows/verify-guides.yml
+    with:
+      test-file: "billion-scale-vector-search/README.md"

.github/workflows/verify-guides-main.yml

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+name: Verify Giudes (Main)
+
+on:
+  workflow_dispatch: # Allow manual triggering of this workflow.
+
+  push:
+    branches: ["master"]
+    paths-ignore:
+      - "billion-scale-vector-search/"
+      - "billion-scale-image-search/"
+      - "examples/model-deployment/"
+
+  pull_request:
+    branches: ["master"]
+    paths-ignore:
+      - "billion-scale-vector-search/"
+      - "billion-scale-image-search/"
+      - "examples/model-deployment/"
+
+jobs:
+  main:
+    uses: ./.github/workflows/verify-guides.yml
+    with:
+      test-config-path: "test/_test_config.yml"

.github/workflows/verify-guides.yml

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+name: Verify Giudes
+
+on:
+  workflow_call:
+    inputs:
+      test-config-path:
+        description: |
+          The path to the test configuration file, relative to the repository root.
+
+          ::warning:: This is mutually exclusive with `test-file`.
+
+          Example: `test/_test_config.yml`
+        type: string
+        required: false
+      test-file:
+        description: |
+          The path to the test file, relative to the repository root. This is used to run tests for a specific guide.
+
+          ::warning:: This is mutually exclusive with `test-config-path` and will take precedence over it.
+
+          Example: `billion-scale-vector-search/README.md`
+        type: string
+        required: false
+
+defaults:
+  run:
+    # Specify to ensure "pipefail and errexit" are set.
+    # Ref: https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#defaultsrunshell
+    shell: bash
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    env:
+      LANG: "C.UTF-8"
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.github/actions/free-space
+
+      - uses: ./.github/actions/install-deps
+
+      - name: run-tests (config)
+        if: ${{ inputs.test-config-path  && !inputs.test-file }}
+        run: |
+          ./test/test.py -w $GITHUB_WORKSPACE -c ${{ inputs.test-config-path }}
+
+      - name: run-tests (file)
+        if: ${{ inputs.test-file && !inputs.test-config-path }}
+        run: |
+          ./test/test.py -w $GITHUB_WORKSPACE ${{ inputs.test-file }}