sorted out issue w/ binding to localhost and with caching gems outside of container

docker-compose.yaml

@@ -6,17 +6,17 @@ services:
   jekyll-serve:
     container_name: jekyll-serve
     image: jekyll/jekyll
-    # command: jekyll serve --future --draft --force_polling --livereload
-    command: bash -c "bundle install && jekyll serve --future --draft --force_polling --livereload"
-    # command: bash -c "bundle install && bundle exec jekyll serve --watch --incremental --future --draft --force_polling --livereload"
+    # here's why we need --host 0.0.0.0
+    # https://superuser.com/questions/949428/whats-the-difference-between-127-0-0-1-and-0-0-0-0
+    command: bash -c "bundle update && bundle exec jekyll serve --host 0.0.0.0 --future --draft --force_polling --livereload"
     environment:
       JEKYLL_ENV: local
-    # network_mode: host
     ports:
       - 4000:4000
       - 35729:35729
     volumes:
       - .:/srv/jekyll
+      - .bundle:/usr/local/bundle
 
   # build and push to rubygems.org
 
@@ -29,11 +29,13 @@ services:
           require \"rubygems\"; \
           spec = Gem::Specification::load(\"jekyll-theme-isabelline.gemspec\"); \
           puts \"#{spec.version}\"'` \
-        && gem push -v jekyll-theme-isabelline-$${GEM_VER}.gem \
-        && rm jekyll-theme-isabelline-$${GEV_VER}.gem
+        && gem push jekyll-theme-isabelline-$${GEM_VER}.gem \
+        && rm jekyll-theme-isabelline-*.gem
       "
     volumes:
       - .:/srv/jekyll
+      - .bundle:/usr/local/bundle
+      - ./.gem:/root/.gem
 
   # helpers
 
@@ -44,6 +46,7 @@ services:
     environment:      
       JEKYLL_ENV: local
     volumes:
+      - .bundle:/usr/local/bundle
       - .:/srv/jekyll
 
   gem:
@@ -51,13 +54,14 @@ services:
     image: jekyll/jekyll
     entrypoint: gem
     volumes:
+      - .bundle:/usr/local/bundle
       - .:/srv/jekyll
-      - ./.gem:/root/.gem
 
   bundle:
     container_name: jekyll
     image: jekyll/jekyll
     entrypoint: bundle
     volumes:
+      - .bundle:/usr/local/bundle
       - .:/srv/jekyll
       - ./.gem:/root/.gem