(maint) Bump version to 2.4.0

Upgrade to jruby 9.3.6.0
Remove workaround for jruby 9.2 using JRUBY_OPTS=-Xinvokedynamic.yield=false
Removed unused dependency nokogiri?

docker/Dockerfile

@@ -1,12 +1,12 @@
 # This Dockerfile is intended to be used with the
 # docker-compose file in the same directory.
 
-FROM jruby:9.2-jdk
+FROM jruby:9.3-jdk
 
 ENV RACK_ENV=production
 
 RUN apt-get update -qq && \
-    apt-get install -y --no-install-recommends make && \
+    apt-get install -y --no-install-recommends make git && \
     apt-get clean autoclean && \
     apt-get autoremove -y && \
     rm -rf /var/lib/apt/lists/*

docker/docker-compose.yml

@@ -18,7 +18,6 @@ services:
       - VMPOOLER_CONFIG_FILE=/etc/vmpooler/vmpooler.yaml
       - REDIS_SERVER=redislocal
       - LOGFILE=/dev/null
-      - JRUBY_OPTS=-Xinvokedynamic.yield=false
       - VMPOOLER_TRACING_ENABLED=true
       - VMPOOLER_TRACING_JAEGER_HOST=http://jaeger-aio:14268/api/traces
     image: vmpooler-local

docker/update-gemfile-lock.sh

@@ -4,5 +4,5 @@ docker run -it --rm \
   -v $(pwd)/docker:/app \
   -v $(pwd):/app/vmpooler-source \
   $(grep ^FROM docker/Dockerfile |cut -d ' ' -f2) \
-  /bin/bash -c 'apt-get update -qq && apt-get install -y --no-install-recommends make && cd /app && gem install bundler && bundle install --jobs 3 && bundle update; echo "LOCK_FILE_UPDATE_EXIT_CODE=$?"'
+  /bin/bash -c 'apt-get update -qq && apt-get install -y --no-install-recommends make git && cd /app && gem install bundler && bundle install --jobs 3 && bundle update; echo "LOCK_FILE_UPDATE_EXIT_CODE=$?"'
 rmdir docker/vmpooler-source