fix: address bundler system and without flag deprecations in Dockerfile (alpine)

Author: hugginsio

Dockerfile-alpine

@@ -9,7 +9,9 @@ COPY . /devdocs
 
 RUN apk --update add nodejs build-base libstdc++ gzip git zlib-dev libcurl && \
     gem install bundler && \
-    bundle install --system --without test && \
+    bundle config set path.system true && \
+    bundle config set without 'test' && \
+    bundle install && \
     thor docs:download --all && \
     thor assets:compile && \
     apk del gzip build-base git zlib-dev && \