Revert binary gems (fix #589) (#590)

* Revert platform change
* Add Docker image to CI

.github/workflows/ci.yml

@@ -63,3 +63,19 @@ jobs:
         run: |
           bundle exec rake db:setup
           bundle exec rake
+
+  docker:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Cleanup
+        run: docker system prune --all --force --volumes
+
+      - name: Build Docker image
+        run: docker build --tag voctoweb:$(date +%s) .
+
+      - name: Show images
+        run: docker images

Gemfile.lock

@@ -172,8 +172,7 @@ GEM
     goldiloader (4.1.1)
       activerecord (>= 5.2, < 7.1)
       activesupport (>= 5.2, < 7.1)
-    google-protobuf (3.17.3-universal-darwin)
-    google-protobuf (3.17.3-x86_64-linux)
+    google-protobuf (3.17.3)
     graphiql-rails (1.8.0)
       railties
       sprockets-rails
@@ -228,16 +227,16 @@ GEM
     marcel (1.0.1)
     method_source (1.0.0)
     mini_mime (1.1.0)
+    mini_portile2 (2.6.1)
     minitest (5.14.4)
     multi_json (1.15.0)
     multipart-post (2.1.1)
     net-scp (3.0.0)
       net-ssh (>= 2.6.5, < 7.0.0)
     net-ssh (6.1.0)
     nio4r (2.5.7)
-    nokogiri (1.12.4-x86_64-darwin)
-      racc (~> 1.4)
-    nokogiri (1.12.4-x86_64-linux)
+    nokogiri (1.12.4)
+      mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
     orm_adapter (0.5.0)
     pg (1.2.3)
@@ -378,8 +377,7 @@ GEM
     yajl-ruby (1.4.1)
 
 PLATFORMS
-  x86_64-darwin-18
-  x86_64-linux
+  ruby
 
 DEPENDENCIES
   aasm