use official prometheus repo

.env.dist

@@ -1,3 +1,2 @@
 PROMETHEUS_CONFIG_FILE_PATH=/path/to/prometheus/config/prometheus.yaml
 PROMETHEUS_DATA_PATH=/path/to/prometheus/data
-PROMETHEUS_REPO='https://github.com/prometheus/prometheus.git'

Dockerfile

@@ -1,47 +0,0 @@
-ARG GO_VERSION=alpine
-
-FROM golang:${GO_VERSION} as build
-
-ARG PROMETHEUS_VERSION=
-ARG PROMETHEUS_REPO
-
-RUN \
-	apk update --no-cache &&\
-	apk add --no-cache \
-		bash \
-		curl \
-		git \
-		make \
-		yarn && \
-	git config --global advice.detachedHead false
-RUN \
-	echo "selected repo: ${PROMETHEUS_REPO}" && \
-	if [ -z "${PROMETHEUS_VERSION}" ]; then \
-		PROMETHEUS_VERSION=$( \
-			git ls-remote "${PROMETHEUS_REPO}" | \
-			awk '$2 ~ /^refs\/tags\/v[0-9]+\.[0-9]+\.[0-9]+$/ { print substr($2,11) }' | sort -V | tail -n1 \
-		) ; \
-	fi && \
-	echo "selected prometheus branch: ${PROMETHEUS_VERSION}" && \
-	cd / && \
-	git clone \
-		--branch="${PROMETHEUS_VERSION}" \
-		--depth=1 \
-		"${PROMETHEUS_REPO}" \
-		prometheus && \
-	cd prometheus && \
-	CGO_ENABLED=0 make build
-
-FROM alpine:3
-
-COPY --from=build /prometheus/prometheus /prometheus
-RUN mkdir /data
-
-ENV UID=1000
-ENV GID=1000
-
-CMD (grep -qE '^prometheus:x:'"${UID}"':prometheus$' /etc/group || addgroup -g "${GID}" prometheus) && \
-	(grep -qE '^prometheus:x:'"${UID}"':'"${GID}"':.*$' /etc/passwd || adduser -D -u "${UID}" -G prometheus prometheus) && \
-	chmod 700 /prometheus && chown prometheus:prometheus /prometheus && \
-	chown prometheus:prometheus /data && \
-	su prometheus -c '/prometheus --config.file=/config/prometheus.yaml --storage.tsdb.path=/data/' 2>&1

docker-compose.yaml

@@ -2,12 +2,13 @@ version: '3'
 
 services:
   prometheus:
-    build:
-      context: ./
-      args:
-        - PROMETHEUS_REPO=${PROMETHEUS_REPO}
     container_name: prometheus
-    image: prometheus:local
+    image: prom/prometheus
+    command: >
+      --storage.tsdb.path=/prometheus
+      --config.file=/etc/prometheus/prometheus.yml
+      --storage.tsdb.retention.time=30d
+      --storage.tsdb.retention.size=2GB
     logging:
       driver: journald
       options:
@@ -16,6 +17,6 @@ services:
     ports:
       - 9090:9090
     volumes:
-      - ${PROMETHEUS_CONFIG_FILE_PATH}:/config/prometheus.yaml:ro
-      - ${PROMETHEUS_DATA_PATH}:/data:rw
+      - ${PROMETHEUS_CONFIG_FILE_PATH}:/etc/prometheus/prometheus.yml:ro
+      - ${PROMETHEUS_DATA_PATH}:/prometheus:rw