Add github action configuration

Author: Greg Bowler

Dockerfile

@@ -0,0 +1,9 @@
+FROM phpstan/phpstan:0.12
+
+LABEL version="1.0.0"
+LABEL repository="https://github.com/php-actions/phpstan"
+LABEL homepage="https://github.com/php-actions/phpstan"
+LABEL maintainer="Greg Bowler <greg.bowler@g105b.com>"
+
+COPY entrypoint /usr/local/bin/entrypoint
+ENTRYPOINT ["/usr/local/bin/entrypoint"]

action.yml

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+name: PHPStan (php-actions)
+description: PHP Static Analysis in Github Actions.
+
+inputs:
+  configuration:
+    description: Configuration file location
+    required: false
+  level:
+    description: Level of rule options - the higher the stricter
+    required: false
+  paths_file:
+    description: Path to a file with a list of paths to run analysis on
+    required: false
+  autoload_file:
+    description: Project's additional autoload file path
+    required: false
+  error_format:
+    description: Format in which to print the result of the analysis
+    required: false
+  generate_baseline:
+    description: Path to a file where the baseline should be saved
+    required: false
+  memory_limit:
+    description: Memory limit for analysis
+    required: false
+  args:
+    description: Extra arguments to pass to the phpstan binary
+    required: false
+
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  env:
+    action_configuration: ${{ inputs.configuration }}
+    action_level: ${{ inputs.level }}
+    action_paths_file: ${{ inputs.paths_file }}
+    action_autoload_file: ${{ inputs.autoload_file }}
+    action_error_format: ${{ inputs.error_format }}
+    action_generate_baseline: ${{ inputs.generate_baseline }}
+    action_memory_limit: ${{ inputs.memory_limit }}
+    action_args: ${{ inputs.args }}
+
+branding:
+  icon: 'check-square'
+  color: 'purple'

entrypoint

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+#!/bin/bash
+set -e
+
+command_string="phpstan"
+
+if [ -n "$action_configuration" ]
+then
+	command_string="$command_string --configuration='$action_configuration'"
+fi
+
+if [ -n "$action_level" ]
+then
+	command_string="$command_string --level=$action_level"
+fi
+
+if [ -n "$action_paths_file" ]
+then
+	command_string="$command_string --paths-file='$action_paths_file'"
+fi
+
+if [ -n "$action_autoload_file" ]
+then
+	command_string="$command_string --autoload-file='$action_autoload_file'"
+fi
+
+if [ -n "$action_error_format" ]
+then
+	command_string="$command_string --error-format=$action_error_format"
+fi
+
+if [ -n "$action_generate_baseline" ]
+then
+	command_string="$command_string --generate-baseline=$action_generate_baseline"
+fi
+
+if [ -n "$action_memory_limit" ]
+then
+	command_string="$command_string --memory-limit=$action_memory_limit"
+fi
+
+if [ -n "$action_args" ]
+then
+	command_string="$command_string $action_args"
+fi
+
+echo "Command: $command_string"
+eval "$command_string"