make upstream repo configurable

.env.dist

@@ -1,2 +1,3 @@
 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

@@ -3,7 +3,7 @@ ARG GO_VERSION=alpine
 FROM golang:${GO_VERSION} as build
 
 ARG PROMETHEUS_VERSION=
-ARG PROMETHEUS_REPO="https://github.com/prometheus/prometheus.git"
+ARG PROMETHEUS_REPO
 
 RUN \
 	apk update --no-cache &&\
@@ -15,6 +15,7 @@ RUN \
 		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}" | \
@@ -26,7 +27,8 @@ RUN \
 	git clone \
 		--branch="${PROMETHEUS_VERSION}" \
 		--depth=1 \
-		"${PROMETHEUS_REPO}" && \
+		"${PROMETHEUS_REPO}" \
+		prometheus && \
 	cd prometheus && \
 	CGO_ENABLED=0 make build
 

docker-compose.yaml

@@ -4,6 +4,8 @@ services:
   prometheus:
     build:
       context: ./
+      args:
+        - PROMETHEUS_REPO=${PROMETHEUS_REPO}
     container_name: prometheus
     image: prometheus:local
     logging: