add docker local dev stuff

docker/Dockerfile

@@ -0,0 +1,21 @@
+FROM urre/wordpress-nginx-docker-compose-image:1.4.0
+
+# PHP Extensions
+RUN docker-php-ext-configure calendar && docker-php-ext-install calendar
+
+# Install wp-cli
+RUN apt-get update && apt-get install -y sudo less mariadb-client
+RUN curl -o /bin/wp-cli.phar https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
+RUN chmod +x /bin/wp-cli.phar
+RUN cd /bin && mv wp-cli.phar wp
+RUN mkdir -p /var/www/.wp-cli/cache && chown www-data:www-data /var/www/.wp-cli/cache
+
+# Install composer
+COPY --from=composer:latest /usr/bin/composer /usr/local/bin/composer
+
+# Forward Message to mailhog
+RUN curl --location --output /usr/local/bin/mhsendmail https://github.com/mailhog/mhsendmail/releases/download/v0.2.0/mhsendmail_linux_amd64 && \
+    chmod +x /usr/local/bin/mhsendmail
+RUN echo 'sendmail_path="/usr/local/bin/mhsendmail --smtp-addr=mailhog:1025 --from=no-reply@gbp.lo"' > /usr/local/etc/php/conf.d/mailhog.ini
+
+# Note: Use docker-compose up -d --force-recreate --build when Dockerfile has changed.