environment for developing and running the action

.env.example

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+GITEA_INSTANCE_BASE_URL="https://gitea.example.com"

.gitignore

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-.idea
+.idea
+/.env

Dockerfile

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+FROM rosven9856/basic-php-fpm-alpine:8.2.12.2
+
+RUN addgroup -g 1000 --system php
+RUN adduser -G php --system -D -s /bin/sh -u 1000 php
+
+RUN chown php:php /home/php
+RUN chown php:php /usr/local/bin/composer
+
+RUN mkdir /var/src
+RUN chown -R php:php /var/src
+
+WORKDIR /var/src
+
+COPY ./src /var/src
+
+# RUN composer install
+
+USER php
+
+CMD ["php", "/var/src/app.php"]

docker-compose.yml

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+version: "3"
+services:
+  php-fpm:
+    container_name: php-fpm
+    build:
+      context: ./
+      dockerfile: Dockerfile
+    environment:
+      GITEA_INSTANCE_BASE_URL: ${GITEA_INSTANCE_BASE_URL}
+    volumes:
+      - ./src:/var/src
+    networks:
+      - bridge
+networks:
+  bridge:
+    driver: bridge

src/app.php

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+<?php