fix prom example and add test

Author: zeitlinger

.github/workflows/prometheus-test.yml

@@ -1,4 +1,4 @@
-name: OATS Tests
+name: Prometheus Test
 
 on:
   pull_request:

.mise/tasks/prometheus-test.sh

@@ -6,6 +6,7 @@ set -euo pipefail
 cd prometheus
 ../gradlew shadowJar
 # start docker compose in background
+docker compose create
 docker compose start
 
 # check that 200 is returned from the metrics endpoint

prometheus/Dockerfile

@@ -2,4 +2,4 @@ FROM eclipse-temurin:11.0.29_7-jre@sha256:5a9b558567e6a2f7fbaa5000891caf515c31db
 
 ADD build/libs/opentelemetry-examples-prometheus-*-SNAPSHOT-all.jar /app.jar
 
-ENTRYPOINT java -cp app.jar io.opentelemetry.example.prometheus.PrometheusExample 19090
+ENTRYPOINT exec java -cp app.jar io.opentelemetry.example.prometheus.PrometheusExample 19090

prometheus/docker-compose.yml

@@ -1,4 +1,3 @@
-version: '3'
 services:
   app:
     build: ./