Made composer.lock file optional in docker

Author: transistive

Dockerfile

@@ -23,7 +23,7 @@ RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local
 
 WORKDIR /opt/project
 
-COPY composer.json composer.lock phpunit.xml.dist phpunit.coverage.xml.dist psalm.xml .php-cs-fixer.php ./
+COPY composer.json composer.loc[k] phpunit.xml.dist phpunit.coverage.xml.dist psalm.xml .php-cs-fixer.php ./
 COPY src/ src/
 COPY tests/ tests/
 COPY .git/ .git/