Adds influxdb user to alpine Dockerfiles

Allow containers to be run as non root by adding an influxdb user and 
group. Home directory of the user is set to the data dir of influx

Author: anguswilliams

influxdb/1.5/alpine/Dockerfile

@@ -23,7 +23,9 @@ RUN set -ex && \
     chmod +x /usr/src/influxdb-*/* && \
     cp -a /usr/src/influxdb-*/* /usr/bin/ && \
     rm -rf *.tar.gz* /usr/src /root/.gnupg && \
-    apk del .build-deps
+    apk del .build-deps && \
+    addgroup -g 1000 influxdb && \
+    adduser -G influxdb -u 1000 -S -h /var/lib/influxdb influxdb
 COPY influxdb.conf /etc/influxdb/influxdb.conf
 
 EXPOSE 8086

influxdb/1.6/alpine/Dockerfile

@@ -23,7 +23,9 @@ RUN set -ex && \
     chmod +x /usr/src/influxdb-*/* && \
     cp -a /usr/src/influxdb-*/* /usr/bin/ && \
     rm -rf *.tar.gz* /usr/src /root/.gnupg && \
-    apk del .build-deps
+    apk del .build-deps && \
+    addgroup -g 1000 influxdb && \
+    adduser -G influxdb -u 1000 -S -h /var/lib/influxdb influxdb
 COPY influxdb.conf /etc/influxdb/influxdb.conf
 
 EXPOSE 8086

influxdb/1.7/alpine/Dockerfile

@@ -23,7 +23,9 @@ RUN set -ex && \
     chmod +x /usr/src/influxdb-*/* && \
     cp -a /usr/src/influxdb-*/* /usr/bin/ && \
     rm -rf *.tar.gz* /usr/src /root/.gnupg && \
-    apk del .build-deps
+    apk del .build-deps && \
+    addgroup -g 1000 influxdb && \
+    adduser -G influxdb -u 1000 -S -h /var/lib/influxdb influxdb
 COPY influxdb.conf /etc/influxdb/influxdb.conf
 
 EXPOSE 8086

influxdb/nightly/alpine/Dockerfile

@@ -21,7 +21,9 @@ RUN set -ex && \
     chmod +x /usr/src/influxdb-*/* && \
     cp -a /usr/src/influxdb-*/* /usr/bin/ && \
     rm -rf *.tar.gz* /usr/src /root/.gnupg && \
-    apk del .build-deps
+    apk del .build-deps && \
+    addgroup -g 1000 influxdb && \
+    adduser -G influxdb -u 1000 -S -h /var/lib/influxdb influxdb
 COPY influxdb.conf /etc/influxdb/influxdb.conf
 
 EXPOSE 8083 8086