Update Dockerfile, deprecated statements updated

Dockerfile

@@ -1,17 +1,16 @@
 FROM metabrainz/consul-template-base:ct_0.33.0-jammy-1.0.1-v0.4-1
 
-MAINTAINER Laurent Monin <[email protected]>
 RUN apt-get update && apt-get upgrade -y -o Dpkg::Options::="--force-confold"
 RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 RUN rm -f /core
 
-ENV TELEGRAF_DEB telegraf_1.32.3-1_amd64.deb
+ENV TELEGRAF_DEB=telegraf_1.32.3-1_amd64.deb
 RUN wget https://dl.influxdata.com/telegraf/releases/${TELEGRAF_DEB} && dpkg -i ${TELEGRAF_DEB} && rm -f ${TELEGRAF_DEB}
 
-ENV INFLUX_SERVER "http://localhost:8086"
-ENV INFLUX_DB "telegraf-docker"
-ENV DC "testing"
-ENV HOST "telegraf-docker"
+ENV INFLUX_SERVER="http://localhost:8086"
+ENV INFLUX_DB="telegraf-docker"
+ENV DC="testing"
+ENV HOST="telegraf-docker"
 
 RUN mkdir -p /etc/telegraf/telegraf.d
 COPY files/telegraf/telegraf.conf /etc/telegraf/