Upgrade Java version to 17 in Dockerfile

Motivation:

The latest Central Dogma docker image failes to start up on
the `ubuntu-latest` image of GitHub Actions due to the following NPE:
```
Error: -20 09:22:41.518 [ERROR](c.l.c.s.Main) [main] Failed to start the Central Dogma:
java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.base/java.util.concurrent.CompletableFuture.reportGet(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture.get(Unknown Source)
	at com.linecorp.armeria.common.util.EventLoopCheckingFuture.get(EventLoopCheckingFuture.java:73)
	at com.linecorp.centraldogma.server.Main.start(Main.java:138)
	at com.linecorp.centraldogma.server.Main.main(Main.java:238)
Caused by: java.lang.NullPointerException: null
	at java.base/jdk.internal.platform.cgroupv2.CgroupV2Subsystem.getInstance(Unknown Source)
	at java.base/jdk.internal.platform.CgroupSubsystemFactory.create(Unknown Source)
	at java.base/jdk.internal.platform.CgroupMetrics.getInstance(Unknown Source)
	at java.base/jdk.internal.platform.SystemMetrics.instance(Unknown Source)
	at java.base/jdk.internal.platform.Metrics.systemMetrics(Unknown Source)
	at java.base/jdk.internal.platform.Container.metrics(Unknown Source)
	at jdk.management/com.sun.management.internal.OperatingSystemImpl.<init>(Unknown Source)
	at jdk.management/com.sun.management.internal.PlatformMBeanProviderImpl.getOperatingSystemMXBean(Unknown Source)
	at jdk.management/com.sun.management.internal.PlatformMBeanProviderImpl$3.nameToMBeanMap(Unknown Source)
	at java.management/sun.management.spi.PlatformMBeanProvider$PlatformComponent.getMBeans(Unknown Source)
	at java.management/java.lang.management.ManagementFactory.getPlatformMXBean(Unknown Source)
	at java.management/java.lang.management.ManagementFactory.getOperatingSystemMXBean(Unknown Source)
	at io.micrometer.core.instrument.binder.system.FileDescriptorMetrics.<init>(FileDescriptorMetrics.java:78)
	at io.micrometer.core.instrument.binder.system.FileDescriptorMetrics.<init>(FileDescriptorMetrics.java:74)
	at com.linecorp.centraldogma.server.CentralDogma.configureMetrics(CentralDogma.java:1130)
	at com.linecorp.centraldogma.server.CentralDogma.startServer(CentralDogma.java:772)
	at com.linecorp.centraldogma.server.CentralDogma.doStart(CentralDogma.java:474)
	at com.linecorp.centraldogma.server.CentralDogma.access$800(CentralDogma.java:198)
	at com.linecorp.centraldogma.server.CentralDogma$CentralDogmaStartStop.lambda$doStart$0(CentralDogma.java:1306)
	at com.linecorp.centraldogma.server.CentralDogma$CentralDogmaStartStop.lambda$execute$2(CentralDogma.java:1345)
	at java.base/java.lang.Thread.run(Unknown Source)
```
The exception seems fixed by https://bugs.openjdk.org/browse/JDK-8287073

Related: line/centraldogma-python#70

Modifications:

- Upgrade the JRE version of the Docker image to 17
- Add a CI test to check if Central Dogma Docker image starts successfully

Result:

Central Dogma Docker image now starts up propertly in GitHub Actions.

Author: ikhoon

.github/workflows/actions_build.yml

@@ -190,3 +190,26 @@ jobs:
         run: |
           ./gradlew --no-daemon --stacktrace check -PnoLint -PflakyTests=true
         shell: bash
+
+  docker-build:
+    if: github.repository == 'line/centraldogma'
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    env:
+      GRADLE_OPTS: -Xmx1280m
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker Image Build Test
+        # Make sure Central Dogma docker container can be started and healthy.
+        run: |
+          ./gradlew :dist:docker --stacktrace -Pversion=test
+          docker compose -f dist/docker-compose-test.yml up --wait -d
+          docker compose -f  dist/docker-compose-test.yml down
+        shell: bash

dist/Dockerfile

@@ -1,7 +1,7 @@
 #
 # CentralDogma Dockerfile
 #
-FROM openjdk:11-jre
+FROM eclipse-temurin:17-jre
 
 # Multi-platform build arguments (pre-defined by docker)
 ARG TARGETARCH
@@ -37,5 +37,9 @@ COPY --chmod=755 \
 # Expose ports.
 EXPOSE 36462
 
+# Healthcheck – waits for the HTTP API to respond
+HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=10 \
+  CMD curl -f http://127.0.0.1:36462/monitor/l7check || exit 1
+
 # Entrypoint doesn't allow an environment variable.
 ENTRYPOINT ["/opt/centraldogma/bin/startup", "-nodetach"]

dist/build.gradle

@@ -211,9 +211,12 @@ task docker(group: 'Build',
     def buildArgs = [
         'buildx', 'build',
         '--platform', platforms.join(','),
-        '--push'
     ]
 
+    if (imageVersion != 'test') {
+       buildArgs.add('--push')
+    }
+
     buildArgs.add("--tag")
     buildArgs.add("${imageName}:${imageVersion}")
     if (!(project.version =~ /-SNAPSHOT$/)) {

dist/docker-compose-test.yml

@@ -0,0 +1,3 @@
+services:
+  centraldogma:
+    image: ghcr.io/line/centraldogma:test