upgraded golang to 1.12 and fixed dockerfile

Dockerfile

@@ -2,7 +2,7 @@
 FROM ubuntu:16.04
 
 # install operating system packages 
-RUN apt-get update -y &&  apt-get install git curl gettext unzip wget software-properties-common python python-software-properties dnsutils make maven golang-go -y && \
+RUN apt-get update -y &&  apt-get install git curl gettext unzip wget software-properties-common python python-software-properties dnsutils make maven  -y && \
     apt-get upgrade -y
 ## add more packages, if necessary
 # install Java8
@@ -57,18 +57,16 @@ RUN chmod +x loadgen.sh
 
 
 ###### TSBS by Timescale ######
+# install go
+RUN add-apt-repository ppa:longsleep/golang-backports -y
+RUN apt-get update
+RUN apt-get install golang-go -y
+# build TSBS
 RUN mkdir /opt/workloads/tsbs/
 ENV GOPATH /opt/workloads/tsbs/
 RUN cd /opt/workloads/tsbs/
-RUN go get github.com/timescale/tsbs
-RUN cd $GOPATH/src/github.com/timescale/tsbs/cmd
-RUN go get ./...
-RUN cd tsbs_generate_data && go install
-RUN cd ../tsbs_generate_queries && go install
-RUN cd ../tsbs_load_influx && go install
-RUN cd ../tsbs_run_queries_influx && go install
-RUN cd $GOPATH/src/github.com/timescale/tsbs/cmd
-RUN go install ./...
+RUN go get github.com/timescale/tsbs/...
+
 
 # telegraf monitoring 
 RUN mkdir /opt/telegraf ; cd /opt/telegraf ; wget https://dl.influxdata.com/telegraf/releases/telegraf_1.7.0-1_amd64.deb