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Adding xdebug support

Create the following file xdebug.ini

zend_extension=xdebug.so
xdebug.mode=develop,debug
xdebug.discover_client_host=true
xdebug.start_with_request=yes
xdebug.trigger_value=PHPSTORM
xdebug.log_level=0

xdebug.var_display_max_children=10
xdebug.var_display_max_data=10
xdebug.var_display_max_depth=10

xdebug.client_host=host.docker.internal
xdebug.client_port=9003

Add the following command into the Dockerfile.

# Install xdebug
RUN apk add --no-cache php${PHP_VERSION}-pecl-xdebug

# Add configuration
COPY xdebug.ini ${PHP_INI_DIR}/conf.d/xdebug.ini