feat: add fix-magento action (#86)

fix-magento-install/README.md

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+# Fix Magento
+
+A Github Action that fixes Magento before `composer install`. 
+
+> You probably only need this action if you're working on a Magento extension. However, if you're working on a Magento store and your CI pipeline breaks, this is probably a good first place to look for corrective measures to take.
+
+## Inputs
+
+See the [action.yml](./action.yml)
+
+## Usage
+
+```yml
+name: Fix Magento Install
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+
+jobs:
+  fix:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: graycoreio/github-actions-magento2/fix-magento-install@main
+      with:
+        magento_directory: path/to/magento
+```

fix-magento-install/action.yml

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+name: "Fix Magento Install"
+author: "Graycore"
+description: "A Github Action that fixes Magento before `composer install`"
+inputs:
+  magento_directory:
+    required: true
+    description: "The folder where Magento is installed"
+
+runs:
+  using: "composite"
+  steps:
+    - uses: graycoreio/github-actions-magento2/get-magento-version@main
+      id: init-magento-get-magento-version
+      with:
+        working-directory: ${{ inputs.magento_directory }}
+
+    - run: echo "::set-output name=version::$(composer --version | awk '{print $3}')"
+      shell: bash
+      name: Compute Composer Version
+      id: init-magento-get-composer-version
+
+    - run: composer require monolog/monolog:"<2.7.0" --no-update
+      shell: bash
+      name: Fixup Monolog (https://github.com/magento/magento2/pull/35596)
+      working-directory: ${{ inputs.magento_directory }}
+      if: |
+        steps.init-magento-get-magento-version.outputs.version == '"2.4.4"'
+
+    - run: composer require "dotmailer/dotmailer-magento2-extension-package:4.6.0-p2 as 4.6.0" --no-update
+      shell: bash
+      name: Fixup Dotmailer (https://devdocs.magento.com/guides/v2.4/release-notes/release-notes-2-4-0-commerce.html#dotdigital-1)
+      working-directory: ${{ inputs.magento_directory }}
+      if: |
+        steps.init-magento-get-magento-version.outputs.version == '"2.4.0"'
+
+    - run: |
+        composer config --no-interaction allow-plugins.dealerdirect/phpcodesniffer-composer-installer true
+        composer config --no-interaction allow-plugins.laminas/laminas-dependency-plugin true
+        composer config --no-interaction allow-plugins.magento/* true
+      name: Fixup Composer Plugins
+      shell: bash
+      working-directory: ${{ inputs.magento_directory }}
+      if: |
+        !startsWith(steps.init-magento-get-composer-version.outputs.version, 1)
+
+branding:
+  icon: "code"
+  color: "green"