Implement PHPCS GitHub Action

This installs PHPCS and some nice addon standards to be used as GitHub
Action.

.dockerignore

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+.git

.gitignore

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+*~
+*.swp

.gitmodules

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+[submodule "phpcs/phpcs-core"]
+	path = thirdparty/phpcs-core
+	url = https://github.com/PHPCSStandards/PHP_CodeSniffer/
+[submodule "phpcs/phpcompatibility"]
+	path = thirdparty/phpcompatibility
+	url = https://github.com/PHPCompatibility/PHPCompatibility
+[submodule "phpcs/phpcsutils"]
+	path = thirdparty/phpcsutils
+	url = https://github.com/PHPCSStandards/PHPCSUtils
+[submodule "phpcs/phpcsextra"]
+	path = thirdparty/phpcsextra
+	url = https://github.com/PHPCSStandards/PHPCSExtra
+[submodule "thirdparty/security"]
+	path = thirdparty/security
+	url = https://github.com/FloeDesignTechnologies/phpcs-security-audit
+[submodule "thirdparty/wordpress"]
+	path = thirdparty/wordpress
+	url = https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards

Dockerfile

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+FROM ghcr.io/seravo/ubuntu:noble
+
+RUN apt-setup && \
+    apt-get --assume-yes install \
+      php-cli \
+      php-xml && \
+    apt-cleanup
+
+RUN useradd user
+
+# Install PHP CodeSniffer with WordPress and Security standards
+# NOTE! PHP CodeSniffer master is development version, so one must use latest tagged version instead
+RUN mkdir -p /usr/share/php/PHP
+COPY thirdparty/phpcs-core /usr/share/php/PHP/CodeSniffer
+COPY thirdparty/wordpress /usr/share/php/PHP/CodeSniffer/src/Standards/
+COPY thirdparty/security /usr/share/php/PHP/CodeSniffer/src/Standards/
+COPY thirdparty/phpcompatibility /usr/share/php/PHP/CodeSniffer/src/Standards/
+COPY thirdparty/phpcsutils /usr/share/php/PHP/CodeSniffer/src/Standards/
+COPY thirdparty/phpcsextra /usr/share/php/PHP/CodeSniffer/src/Standards/
+
+USER user
+
+ENTRYPOINT ["/usr/bin/php", "/usr/share/php/PHP/CodeSniffer/bin/phpcs"]

Makefile

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+DOCKER = docker
+IMAGE = ghcr.io/seravo/phpcs:latest
+
+all:
+
+build:
+	$(DOCKER) build -t $(IMAGE) .
+
+run:
+	$(DOCKER) run --rm -it $(IMAGE)
+

action.yml

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+---
+name: "Run PHPCS linter"
+description: "Lint code using PHPCS"
+
+inputs:
+  rules:
+    description: "PHPCS args"
+    required: true
+    default: ''
+
+runs:
+  using: "docker"
+  image: "Dockerfile"
+  args:
+    - ${{ inputs.args }}