added coding-standard-baseline folder for codesniffer baseline task

coding-standard-baseline/README.md

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+# Magento 2 Coding Standard Action
+
+A Github Action that runs the Magento Coding Standard.
+
+## Inputs
+
+See the [action.yml](./action.yml)
+
+## Usage
+
+```yml
+name: Coding Standard baseline
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+
+jobs:
+  coding-standard:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: mage-os/github-actions/coding-standard-baseline@main
+          php_version: 8.1 # Optional, will be used for Php version
+          composer_version: 2
+          version: 31 # Optional, will use the latest if omitted.
+          path: app/code # Optional, will be used when event is not a pull request.
+          severity: 8 # Optional, will use phpcs default of 5 if not specified.
+          warning_severity: 4 # Optional, will use warning severity value if not specified.
+          error_severity: 7 # Optional, will use error severity value if not specified.
+          baseline_version: 1.1.2 # Optional, will use for php codesniffer baseline version
+```

coding-standard-baseline/action.yml

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+name: "M2 Coding Standard"
+author: "Mage-OS"
+description: "A Github Action that runs the Magento Coding Standard."
+
+inputs:
+  php_version:
+    type: string
+    required: true
+    default: "8.1"
+    description: "PHP version used to do the coding standard check."
+
+  composer_version:
+    type: string
+    required: true
+    default: "2"
+    description: "The version of composer to use."
+
+  path:
+    type: string
+    required: true
+    default: 'app/code'
+    description: "The directory (relative to the project root) in which the coding standard will be checked. Used when the event is not a pull request."
+
+  version:
+    type: string
+    required: false
+    default: "31"
+    description: "The version of the coding standard to use. If not provided, will use the latest version."
+
+  severity:
+    type: string
+    required: false
+    default: "8"
+    description: "The minimum severity required to display an error or warning (default: 5)"
+
+  warning_severity:
+    type: string
+    required: false
+    default: "8"
+    description: "The minimum severity required to display a warning"
+
+  error_severity:
+    type: string
+    required: false
+    default: "8"
+    description: "The minimum severity required to display an error"
+
+  baseline_version:
+    type: string
+    required: false
+    default: "1.1.2"
+    description: "version of phpcs baseline"
+
+runs:
+  using: composite
+  steps:
+    - name: Checkout Project
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+
+    - name: Set PHP Version
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ inputs.php_version }}
+        tools: composer:v${{ inputs.composer_version }}
+        coverage: none
+
+    - name: Install Coding Standard && Codesniffer baseline
+      shell: bash
+      run: |
+        git config --global advice.detachedHead false
+        composer require "magento/magento-coding-standard: ${{ github.event.inputs.version || '*' }}" -W
+        composer config --no-plugins allow-plugins.digitalrevolution/php-codesniffer-baseline true
+        composer require --dev "digitalrevolution/php-codesniffer-baseline: ${{ github.event.inputs.baseline_version || '*' }}"
+
+    - name: Register Coding Standard
+      shell: bash
+      run: vendor/bin/phpcs --config-set installed_paths ${{ github.workspace }}/vendor/magento/magento-coding-standard,${{ github.workspace }}/vendor/phpcompatibility/php-compatibility
+
+    - name: Get all changed files
+      id: changed-files
+      uses: tj-actions/changed-files@v35
+      with:
+        write_output_files: true
+        output_dir: ${{ github.workspace }}
+        separator: " "
+
+    - name: Verify the contents of the modified_files.txt file
+      shell: bash
+      run: |
+        sed "s/ /\n/g" ${{ github.workspace }}/modified_files.txt > ${{ github.workspace }}/newline_file.txt
+        grep -iE "\.php|\.phtml" ${{ github.workspace }}/newline_file.txt > ${{ github.workspace }}/phpcs_files.txt
+        cat ${{ github.workspace }}/phpcs_files.txt
+
+    - name: Checkout - Before Merge
+      shell: bash
+      id: previous-commit-files
+      run: |
+        if ${{ github.event_name == 'pull_request' }}; then
+          git checkout ${{ github.event.pull_request.base.ref }}
+        else
+          git checkout ${{ github.event.before }}
+        fi
+
+    - name: Filter php files and execute phpcs - Before Merge
+      shell: bash
+      id: phpcs_before
+      run: |
+        php vendor/bin/phpcs --standard=Magento2 \
+        $([ -n "${{ inputs.severity }}" ] && echo "--severity=${{ inputs.severity }}") \
+        $([ -n "${{ inputs.warning_severity }}" ] && echo "--warning-severity=${{ inputs.warning_severity }}") \
+        $([ -n "${{ inputs.error_severity }}" ] && echo "--error-severity=${{ inputs.error_severity }}") \
+        --report=\\DR\\CodeSnifferBaseline\\Reports\\Baseline --report-file=${{ github.workspace }}/phpcs.baseline.xml --file-list=${{ github.workspace }}/phpcs_files.txt || /bin/true
+
+    - name: Checkout after Merge and execute phpcs
+      shell: bash
+      id: latest-files
+      run: |
+        if ${{ github.event_name == 'pull_request' }}; then
+          git checkout ${{ github.event.pull_request.head.ref }}
+        else
+          git checkout ${{ github.event.after }}
+        fi
+        php vendor/bin/phpcs --standard=Magento2 \
+        $([ -n "${{ inputs.severity }}" ] && echo "--severity=${{ inputs.severity }}") \
+        $([ -n "${{ inputs.warning_severity }}" ] && echo "--warning-severity=${{ inputs.warning_severity }}") \
+        $([ -n "${{ inputs.error_severity }}" ] && echo "--error-severity=${{ inputs.error_severity }}") \
+        --file-list=${{ github.workspace }}/phpcs_files.txt