Late answer ...

I've played around with github actions and PHPCompatibility check these days.

If you use composer for you project, you dont need a docker image.

Add (dev) dependencies:

• squizlabs/php_codesniffer
• phpcompatibility/php-compatibility

(Auto-)Install PHPCompatibility (and other) rules

• dealerdirect/phpcodesniffer-composer-installer

Add Workflow file to .github/workflows with ...

    ...
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: PHPCodeSniffer
        run: php vendor/bin/phpcs <your-options>

E.g. ...

Late answer ...

I've played around with github actions and PHPCompatibility check these days.

If you use composer for you project, you dont need a docker image.

Add (dev) dependencies:

• squizlabs/php_codesniffer
• phpcompatibility/php-compatibility

(Auto-)Install PHPCompatibility (and other) rules

• dealerdirect/phpcodesniffer-composer-installer

Add Workflow file to .github/workflows with ...

    ...
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: PHPCodeSniffer
        run: php vendor/bin/phpcs <your-options>

E.g. ...

Late answer ...

I've played around with github actions and PHPCompatibility check these days.

If you use composer for you project, you dont need a docker image.

Add (dev) dependencies:

• squizlabs/php_codesniffer
• phpcompatibility/php-compatibility

(Auto-)Install PHPCompatibility (and other) rules

• dealerdirect/phpcodesniffer-composer-installer

Add Workflow file to .github/workflows with ...

    ...
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: PHPCodeSniffer
        run: php vendor/bin/phpcs <your-options>

Late answer ...

I've played around with github actions and PHPCompatibility check these days.

If you use composer for you project, you dont need a docker image.

Add (dev) dependencies:

• squizlabs/php_codesniffer
• phpcompatibility/php-compatibility

(Auto-)Install PHPCompatibility (and other) rules

• dealerdirect/phpcodesniffer-composer-installer

Add Workflow file to .github/workflows with ...

    ...
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: PHPCodeSniffer
        run: php vendor/bin/phpcs <your-options>

E.g. ...