Add Docker & instructions

.gitattributes

@@ -3,6 +3,7 @@
 
 # Ignore all test and documentation with "export-ignore".
 /.github                export-ignore
+/docker                 export-ignore
 /stubs                  export-ignore
 /tests                  export-ignore
 /.coveralls.yml         export-ignore
@@ -12,5 +13,7 @@
 /.php-cs-fixer.dist.php export-ignore
 /.php_cs.common.php     export-ignore
 /.php_cs.tests.php      export-ignore
+/docker-compose.yml     export-ignore
+/Makefile               export-ignore
 /phpstan.neon           export-ignore
 /phpunit.xml.dist       export-ignore

Makefile

@@ -0,0 +1,12 @@
+setup:
+	@test -s phpunit.xml || cp phpunit.xml.dist phpunit.xml
+	@docker-compose run --rm app composer install
+
+destroy:
+	@docker-compose down --remove-orphans --volumes
+
+app:
+	@docker-compose run --rm app sh
+
+test:
+	@docker-compose run --rm app sh -c "php ./vendor/bin/phpunit"

README.md

@@ -343,6 +343,32 @@ input LoginInput {
 }
 ```
 
+## Docker
+
+Develop locally using [Docker](https://www.docker.com/) & [Docker Compose](https://docs.docker.com/compose/).
+
+#### Setup
+This will build the Docker image and prepare the container.
+
+```bash
+make setup
+```
+ - CLI: `make app`
+ - Destroy: `make destroy`
+
+#### CLI
+Enter the container with shell to start developing.
+
+```bash
+make app
+```
+
+#### Destroy
+Shutdown and remove the container.
+
+```bash
+make app
+```
 
 ## Testing
 

docker-compose.yml

@@ -0,0 +1,7 @@
+version: '3.7'
+
+services:
+  app:
+    build: docker
+    volumes:
+      - .:/var/www/html:cached

docker/Dockerfile

@@ -0,0 +1,14 @@
+FROM php:8.2-cli-alpine
+
+COPY --from=composer /usr/bin/composer /usr/bin/composer
+
+RUN apk add --no-cache --virtual .build-deps \
+        $PHPIZE_DEPS \
+    && pecl install \
+        pcov \
+    && docker-php-ext-enable \
+        pcov
+
+COPY conf.d /usr/local/etc/php/conf.d
+
+WORKDIR /var/www/html

docker/conf.d/memory-limit.ini

@@ -0,0 +1 @@
+memory_limit = -1