Add graphite docker files

graphite.dockerfile

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+FROM graphiteapp/graphite-statsd AS onlyoffice-graphite
+LABEL maintainer Ascensio System SIA <support@onlyoffice.com>
+
+RUN rm -rf /etc/service/statsd \
+	&& sed 's|\#\?\(DASHBOARD_REQUIRE_AUTHENTICATION = \).*|\1True|g' \
+		-i /opt/graphite/webapp/graphite/local_settings.py \
+	&& sed '26s|\(retentions = \).*|\160s:90d|g' \
+		-i /opt/graphite/conf/storage-schemas.conf

tests/graphite.yaml

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+version: '2.1'
+services:
+  onlyoffice-documentserver:
+    container_name: onlyoffice-documentserver
+    build:
+      context: ../.
+    depends_on:
+      - onlyoffice-graphite
+    environment:
+      - METRICS_ENABLED=${METRICS_ENABLED:-true}
+      - METRICS_HOST="${METRICS_HOST:-localhost}"
+      - METRICS_PORT="${METRICS_PORT:-8125}"
+      - METRICS_PREFIX="${METRICS_PREFIX:-ds.}"
+    stdin_open: true
+    restart: always
+    ports:
+      - '80:80'
+    expose:
+      - '8125'
+
+  onlyoffice-graphite:
+    container_name: onlyoffice-graphite
+    build:
+      context: ../.
+      dockerfile: graphite.dockerfile
+    environment:
+      - GRAPHITE_TIME_ZONE=${GRAPHITE_TIME_ZONE:-Europe/Moscow}
+    ports:
+      - '9999:80'
+    stdin_open: true
+    restart: always