Alpine Docker Image for DRUSH 9

php7-cli.drush9:alpine-3.11.Dockerfile

#
# Build stage optimized with Composer packages for Drupal development.
#
FROM alexanderallen/php7-cli.core:alpine-3.11 as drush9

# Specifies which composer.json file to use for build.
ARG DRUSH_VERSION
RUN \
  cd /tmp \
  && apk add --no-cache \
  # REQ: Composer squizlabs/php_codesniffer 2.7.0 requires ext-tokenizer
  ${PHP_VERSION}-tokenizer \
  # REQ: Composer drupal/coder 8.3.7 requires ext-mbstring
  ${PHP_VERSION}-mbstring

# Provide optional composer example to install.
COPY drush/${DRUSH_VERSION}/composer.json ${COMPOSER_HOME}/composer.json

# Install default CLI tools.
RUN composer global -vvv install

# Configure Drush 9 and above. Can be done by drush core:init instead.
# COPY common/drush.yml /root/.drush/drush.yml

# Inform PHP Code Snifer (phpcs) about Drupal coding standards sniff files.
RUN phpcs --config-set installed_paths ${COMPOSER_HOME}/vendor/drupal/coder/coder_sniffer

# Provide a dynamic entrypoint into the container.
COPY common/entrypoint.sh /root/entrypoint.sh

ENTRYPOINT ["/bin/bash"]

# SSH Agent setup.
COPY common/.bashrc /root/.bashrc