Fixed missing autoload in docker build and optimized caching

Added .dockerignore with basic files

Fixed installing composer in docker + cache optimalization

.dockerignore

@@ -0,0 +1,24 @@
+.DS_Store
+.idea/
+
+.env
+.gitlab-ci.yml
+.travis.yml
+.editorconfig
+.phpstorm.meta.php
+
+LICENSE
+
+.git/
+.gitattributes
+.gitignore
+
+*.md
+
+.dockerignore
+Dockerfile
+docker-compose.yml
+docker-compose.dist.yml
+
+/vendor
+/docs

Dockerfile

@@ -1,15 +1,15 @@
 FROM composer:1.8 AS composer
 
-COPY composer.json composer.json
+RUN composer global require hirak/prestissimo
+
+COPY composer.json composer.json
+RUN  composer install --no-dev --optimize-autoloader --prefer-dist
 
-RUN composer global require hirak/prestissimo && \
-  composer install --prefer-dist --no-scripts --no-dev --no-autoloader && \
-  rm -rf /root/.composer
 
 FROM php:7.1-cli-alpine
-
-COPY --from=composer /app .
+WORKDIR /rector
 
 COPY . .
+COPY --from=composer /app .
 
 ENTRYPOINT [ "bin/rector" ]