feat(setup-magento): create unified setup action

Adds a unified setup action for stores and extensions, making the CI
environment more consistent.

.github/workflows/_internal-setup-magento.yaml

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+name: Setup Magento Test
+
+on:
+  workflow_dispatch: {}
+  push:
+    branches:
+    - main
+    paths:
+    - "setup-magento/**"
+    - ".github/workflows/_internal-setup-magento.yaml"
+    - "supported-version/**"
+    - "!(**/*.md)"
+  pull_request:
+    branches:
+    - main
+    paths:
+    - "setup-magento/**"
+    - ".github/workflows/_internal-setup-magento.yaml"
+    - "supported-version/**"
+    - "!(**/*.md)"
+
+env:
+  PSEUDO_REPO_FOLDER: ../magento_repo
+  magento_folder: ../magento2
+
+jobs:
+  compute_matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.supported-version.outputs.matrix }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./supported-version
+        with:
+          kind: currently-supported
+        id: supported-version
+      - run: echo ${{ steps.supported-version.outputs.matrix }}
+
+  setup-magento-store:
+    needs: compute_matrix
+    strategy:
+      matrix: ${{ fromJSON(needs.compute_matrix.outputs.matrix) }}
+      fail-fast: false
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    - run: |
+        PSEUDO_STORE_FULL_PATH=$(realpath "${{ env.PSEUDO_REPO_FOLDER }}")
+        echo "PSEUDO_STORE_FULL_PATH=$PSEUDO_STORE_FULL_PATH" >> $GITHUB_ENV
+      name: Generate Full Pseudo Store Path
+      shell: bash
+
+    - name: Set PHP Version
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+        tools: composer:v${{ matrix.composer }}
+
+    - uses: actions/cache@v3
+      id: setup-magento-store-cache
+      with:
+        key: setup-magento-ci | ${{ runner.os }} | ${{ matrix.magento }}
+        path: ${{ env.PSEUDO_STORE_FULL_PATH }}
+
+    - run: composer create-project --repository-url="https://mirror.mage-os.org" "${{ matrix.magento }}" "${{ env.PSEUDO_REPO_FOLDER }}" --no-install
+      name: Create Store to simulate a real Magento store in a real repo.
+      if: steps.setup-magento-store-cache.outputs.cache-hit != 'true'
+
+    - uses: ./fix-magento-install
+      name: Fix Magento Out of Box Install Issues
+      with:
+        magento_directory: ${{ env.PSEUDO_REPO_FOLDER }}
+      if: steps.setup-magento-store-cache.outputs.cache-hit != 'true'
+
+    - run: composer install
+      shell: bash
+      working-directory: "${{ env.PSEUDO_REPO_FOLDER }}"
+      if: steps.setup-magento-store-cache.outputs.cache-hit != 'true'
+
+    - run: git init && git config user.email "you@example.com" && git config user.name "Your Name" && git add . && git commit -m "init" && git clean -fdx
+      working-directory: "${{ env.PSEUDO_REPO_FOLDER }}"
+      if: steps.setup-magento-store-cache.outputs.cache-hit != 'true'
+
+    - run: cp -R ${{ env.PSEUDO_REPO_FOLDER }} ${{ env.magento_folder }}
+      shell: bash
+
+    - uses: ./setup-magento
+      with:
+        php-version: ${{ matrix.php }}
+        tools: composer:v${{ matrix.composer }}
+        mode: store
+        working-directory: ${{ env.magento_folder }}
+
+    - uses: graycoreio/github-actions-magento2/cache-magento@cache_magento
+      with:
+        mode: 'store'
+        composer_cache_key:  '${{ matrix.magento }}'
+
+    - run: composer install
+      name: Composer install
+      shell: bash
+      working-directory: ${{ steps.setup-magento.outputs.path }}
+
+  setup-magento-extension:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3 
+
+    - uses: ./setup-magento
+      with:
+        php-version: 8.1
+        tools: composer:v2
+        mode: extension
+        magento_version: 2.4.5-p1
+
+    - uses: graycoreio/github-actions-magento2/cache-magento@cache_magento
+      with:
+        mode: 'extension'
+        composer_cache_key: 'magento-2.4.5-p1'
+
+    - run: composer install
+      name: Composer install
+      shell: bash
+      working-directory: ${{ steps.setup-magento.outputs.path }}

setup-magento/README.md

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+# Magento 2 Package Installation Test Action
+
+A Github Action that sets Magento up to the point of composer install.
+
+## Inputs
+
+See the [action.yml](./action.yml)
+
+## Usage
+
+### Stores
+
+```yml
+name: Setup Magento Store
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  setup-magento-store:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./setup-magento
+        with:
+          php-version: 8.1
+          tools: composer:v2
+          mode: store
+          working-directory: $GITHUB_WORKSPACE
+
+      - run: composer install
+        name: Composer install
+        shell: bash
+        working-directory: ${{ steps.setup-magento.outputs.path }}
+```
+
+### Extensions
+
+```yml
+name: Setup Magento Store
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+
+jobs:
+    setup-magento-extension:
+        runs-on: ubuntu-latest
+        steps:
+        - uses: actions/checkout@v3
+
+        - uses: ./setup-magento
+          with:
+            php-version: 8.1
+            tools: composer:v2
+            mode: extension
+            magento_version: 2.4.5-p1
+
+        - run: composer config repositories.local path $GITHUB_WORKSPACE
+          name: Add Github Repo for Testing
+          working-directory: ${{ steps.setup-magento.outputs.path }}
+          shell: bash
+
+        - run: composer require my/package "@dev"
+          name: Attempt install
+          working-directory: ${{ steps.setup-magento.outputs.path }}
+          shell: bash
+          env:
+            COMPOSER_AUTH: ${{ secrets.composer_auth }}
+```

setup-magento/action.yml

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+name: "Setup Magento"
+author: "Graycore"
+description: "This action sets up a Magento instance for further actions like running tests, etc."
+
+inputs:
+  php-version:
+    description: "Setup PHP version."
+    default: "8.1"
+    required: true
+
+  tools:
+    description: "Setup popular tools globally."
+    required: false
+
+  extensions:
+    description: "Setup PHP extensions."
+    required: false
+
+  coverage:
+    description: "Setup code coverage driver."
+    required: false
+
+  magento_repository:
+    required: false
+    default: "https://mirror.mage-os.org/"
+    description: "Where to install Magento from"
+
+  magento_version: 
+    required: false
+    default: '~2.4.5'
+    description: "The version of Magento to use. This is only relevant if you are testing an extension."
+
+  apply_fixes: 
+    required: false
+    default: 'false'
+    description: "Whether or not to apply fixes during setup."
+
+  mode:
+    required: true
+    default: 'extension'
+    description: "The mode for setup, one of: `extension` or `store`."
+
+  working-directory:
+    required: false
+    default: "."
+    description: "The working directory to run the action in."
+
+outputs:
+  path:
+    description: "The absolute path to where Magento was set up."
+    value: ${{ steps.setup-magento-get-magento-path.outputs.path }}
+
+runs:
+  using: "composite"
+  steps:
+    - name: Set PHP Version
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ inputs.php-version }}
+        tools: ${{ inputs.tools }}
+        coverage: ${{ inputs.coverage }}
+        extensions: ${{ inputs.coverage }}
+
+    - run: |
+        MAGENTO_DIRECTORY=""
+        if [ "${{ inputs.mode }}" = 'extension' ]; then
+            MAGENTO_DIRECTORY="../magento2"
+        else
+            MAGENTO_DIRECTORY="${{ inputs.working_directory }}"
+        fi
+        echo "MAGENTO_DIRECTORY=$MAGENTO_DIRECTORY" >> $GITHUB_OUTPUT
+      id: setup-magento-compute-directory
+      shell: bash
+
+    - run: | 
+        mkdir -p ${{ steps.setup-magento-compute-directory.outputs.MAGENTO_DIRECTORY }}
+      name: Make a directory that may not exist.
+      shell: bash
+      if: inputs.mode == 'extension'
+
+    - run: composer create-project --repository-url="${{ inputs.magento_repository }}" "${{ inputs.magento_version }}" ${{ steps.setup-magento-compute-directory.outputs.MAGENTO_DIRECTORY }} --no-install
+      working-directory: ${{ inputs.working-directory }}
+      shell: bash
+      name: Create Magento ${{ inputs.magento_version }} Project
+      if: inputs.mode == 'extension'
+
+    - uses: graycoreio/github-actions-magento2/fix-magento-install@fix_magento_action
+      name: Fix Magento Out of Box Install Issues
+      with:
+        magento_directory: ${{ steps.setup-magento-compute-directory.outputs.MAGENTO_DIRECTORY }}
+      if: inputs.mode == 'extension' || inputs.apply_fixes == 'true' 
+
+    - run: |
+        echo "path=$(realpath ${{ steps.setup-magento-compute-directory.outputs.MAGENTO_DIRECTORY }})" >> $GITHUB_OUTPUT
+      shell: bash
+      id: setup-magento-get-magento-path
+      
+branding:
+  icon: "code"
+  color: "green"