Hardcode influxdb repo and pyarrow version

Dockerfile

@@ -3,16 +3,9 @@ FROM $FROM
 
 ARG SPARK_NXCALS_URL=http://photons-resources.cern.ch/downloads/nxcals_pro/spark/spark-nxcals.zip
 
-RUN cat <<EOF | tee /etc/yum.repos.d/influxdb.repo \
-[influxdb] \
-name = InfluxDB Repository - RHEL \$releasever \
-baseurl = https://repos.influxdata.com/rhel/\$releasever/\$basearch/stable \
-enabled = 1  \
-gpgcheck = 1 \
-gpgkey = https://repos.influxdata.com/influxdb.key \
-EOF
-
-RUN yum update -y && yum install -y python3 python3-pip python3-virtualenv git unzip bsdtar rsync CERN-CA-certs which influxdb && \
+COPY influxdb.centos7.repo /etc/yum.repos.d/influxdb.repo
+
+RUN yum update -y && yum install -y python3 python3-cython python3-pip python3-virtualenv git unzip bsdtar rsync CERN-CA-certs which influxdb && \
     yum clean all
 
 ENV SPARK_HOME=/opt/nxcals-spark
@@ -34,7 +27,7 @@ USER etlworker
 RUN cd $SPARK_HOME && \
     yes | source $SPARK_HOME/source-me.sh && \
     source $SPARK_HOME/nxcals-python3-env/bin/activate && \
-    pip3 list && pip3 install pyspark==2.3.2 pandas scipy influxdb pyarrow 
+    pip3 list && pip3 install pyspark[sql]==2.3.2 pandas scipy influxdb pyarrow==0.8.0
 
 RUN source $SPARK_HOME/nxcals-python3-env/bin/activate &&  \
     pip3 install git+https://gitlab.cern.ch/industrial-controls/services/dash/dash-etl.git@develop

influxdb.centos7.repo

+[influxdb]
+name = InfluxDB Repository - RHEL 7
+baseurl = https://repos.influxdata.com/rhel/7/x86_64/stable
+enabled = 1 
+gpgcheck = 1
+gpgkey = https://repos.influxdata.com/influxdb.key