fix: sed prometheus env vars (#331)

Author: apham0001

prometheus/prometheus.yml.example

@@ -2,12 +2,12 @@ global:
   scrape_interval: 30s # Set the scrape interval to every 30 seconds.
   evaluation_interval: 30s # Evaluate rules every 30 seconds.
   external_labels:
-    service_owner: ${SERVICE_OWNER} # replace this with your Operator name you want to be identified by, it helps us route alerts and metrics to your notification channels easily
+    service_owner: $SERVICE_OWNER # replace this with your Operator name you want to be identified by, it helps us route alerts and metrics to your notification channels easily
 
 remote_write:
   - url: https://vm.monitoring.gcp.obol.tech/write
     authorization:
-      credentials: ${PROM_REMOTE_WRITE_TOKEN}
+      credentials: $PROM_REMOTE_WRITE_TOKEN
     write_relabel_configs:
       - source_labels: [job]
         regex: "charon"
@@ -32,4 +32,4 @@ scrape_configs:
       - targets: ["node-exporter:9100"]
   - job_name: "cadvisor"
     static_configs:
-      - targets: ["cadvisor:8080"]
+      - targets: ["cadvisor:8080"]

prometheus/run.sh

@@ -2,7 +2,8 @@
 
 if [ -z "$SERVICE_OWNER" ]
 then
-  echo "\$SERVICE_OWNER variable is empty"
+  echo "\$SERVICE_OWNER variable is empty" >&2
+  exit 1
 fi
 
 if [ -z "$PROM_REMOTE_WRITE_TOKEN" ]
@@ -11,8 +12,8 @@ then
   exit 1
 fi
 
-
-sed "s|\$PROM_REMOTE_WRITE_TOKEN|${PROM_REMOTE_WRITE_TOKEN}|g" \
+sed -e "s|\$PROM_REMOTE_WRITE_TOKEN|${PROM_REMOTE_WRITE_TOKEN}|g" \
+    -e "s|\$SERVICE_OWNER|${SERVICE_OWNER}|g" \
     /etc/prometheus/prometheus.yml.example > /etc/prometheus/prometheus.yml
 
 /bin/prometheus \