Add docker support

Author: Andreas Frömer

.docker/php7.3/Dockerfile

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+FROM php:7.3-alpine
+
+COPY --from=mlocati/php-extension-installer /usr/bin/install-php-extensions /usr/bin/
+
+COPY --from=composer:2.0.0-RC2 /usr/bin/composer /usr/bin/composer
+ENV COMPOSER_ALLOW_SUPERUSER 1
+
+WORKDIR /docker
+# Workaround to keep container running
+CMD ["tail", "-f", "/dev/null"]

.docker/php7.4/Dockerfile

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+FROM php:7.4-alpine
+
+COPY --from=mlocati/php-extension-installer /usr/bin/install-php-extensions /usr/bin/
+
+COPY --from=composer:2.0.0-RC2 /usr/bin/composer /usr/bin/composer
+ENV COMPOSER_ALLOW_SUPERUSER 1
+
+WORKDIR /docker
+# Workaround to keep container running
+CMD ["tail", "-f", "/dev/null"]

.docker/php8.0/Dockerfile

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+FROM php:8.0.0RC2-alpine
+
+COPY --from=mlocati/php-extension-installer /usr/bin/install-php-extensions /usr/bin/
+
+COPY --from=composer:2.0.0-RC2 /usr/bin/composer /usr/bin/composer
+ENV COMPOSER_ALLOW_SUPERUSER 1
+
+WORKDIR /docker
+# Workaround to keep container running
+CMD ["tail", "-f", "/dev/null"]

Makefile

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+CONTAINER=systemctl-php-7.4
+
+up:
+	docker-compose up -d
+
+down:
+	docker-compose down
+
+install:
+	docker exec -it $(CONTAINER) composer install
+
+update:
+	docker exec -it $(CONTAINER) composer update
+
+require:
+	docker exec -it $(CONTAINER) composer require $(filter-out $@, $(MAKECMDGOALS))
+
+remove:
+	docker exec -it $(CONTAINER) composer remove $(filter-out $@, $(MAKECMDGOALS))
+
+check: csfix cs phpunit analyse
+
+phpunit:
+	docker exec -it $(CONTAINER) vendor/bin/phpunit
+
+analyse:
+	docker exec -it $(CONTAINER) vendor/bin/phpstan analyse
+
+cs:
+	docker exec -it $(CONTAINER) vendor/bin/phpcs
+
+csfix:
+	docker exec -it $(CONTAINER) vendor/bin/phpcbf
+
+%:
+	@true

docker-compose.yml

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+version: "3.7"
+
+services:
+  php7.3:
+    build: .docker/php7.3
+    container_name: systemctl-php-7.3
+    volumes:
+      - .:/docker:rw
+    tty: true
+
+  php7.4:
+    build: .docker/php7.4
+    container_name: systemctl-php-7.4
+    volumes:
+      - .:/docker:rw
+    tty: true
+
+  php8.0:
+    build: .docker/php8.0
+    container_name: systemctl-php-8.0
+    volumes:
+      - .:/docker:rw
+    tty: true