Update debian package to use Ruby 2.5 instead of 2.2 (cyberark#556)

Dockerfile.fpm

@@ -0,0 +1,25 @@
+# Build from the same version of ubuntu as phusion/baseimage
+FROM @@image@@
+
+RUN apt-get update -y && \
+    apt-get purge -y ruby2.2 ruby2.2-dev && \
+    apt-get install -y ruby2.5 ruby2.5-dev
+
+ENV BUNDLER_VERSION 1.16.1
+RUN gem install --no-rdoc --no-ri bundler:$BUNDLER_VERSION fpm
+
+RUN mkdir -p /src/opt/conjur/project
+
+WORKDIR /src/opt/conjur/project
+
+COPY Gemfile ./
+COPY Gemfile.lock ./
+
+RUN bundle --deployment
+RUN mkdir -p .bundle
+RUN cp /usr/local/bundle/config .bundle/config
+
+COPY . .
+ADD debify.sh /
+
+WORKDIR /src

package.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -ex
-
 debify package \
+  --dockerfile=Dockerfile.fpm \
   possum \
   -- \
   --depends tzdata