update for installation of ruby

Dockerfile

@@ -15,6 +15,7 @@ RUN curl -sL https://deb.nodesource.com/setup_12.x | bash - && \
           postgresql \
           postgresql-contrib \
           rsync \
+          ruby-full \
           vim \
           software-properties-common \
           build-essential \
@@ -30,9 +31,6 @@ RUN curl -sL https://deb.nodesource.com/setup_12.x | bash - && \
     curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl && \
     chmod +x ./kubectl && \
     mv ./kubectl /usr/local/bin/kubectl && \
-    wget https://github.com/kelseyhightower/confd/releases/download/v0.14.0/confd-0.14.0-linux-amd64 && \
-    mv confd-0.14.0-linux-amd64 /usr/local/bin/confd && \
-    chmod 755 /usr/local/bin/confd && \
     curl https://raw.githubusercontent.com/kubernetes/helm/master/scripts/get | bash && \
     wget https://bootstrap.pypa.io/get-pip.py && \
     python get-pip.py && \