hotfix: add integrated Docker healthcheck

Refs #1400

docker/Dockerfile.integrated

@@ -45,4 +45,7 @@ RUN chmod +x /entrypoint-integrated.sh \
 
 EXPOSE 3000 8085 8317
 
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
+  CMD node -e "const http=require('http');const probe=(url)=>new Promise((resolve)=>{const req=http.get(url,(res)=>{res.resume();resolve(res.statusCode<400);});req.on('error',()=>resolve(false));req.setTimeout(4500,()=>{req.destroy();resolve(false);});});Promise.all([probe('http://127.0.0.1:3000/'),probe('http://127.0.0.1:8317/')]).then((results)=>process.exit(results.every(Boolean)?0:1));"
+
 ENTRYPOINT ["/entrypoint-integrated.sh"]

tests/unit/docker/docker-release-workflow-context.test.ts

@@ -35,4 +35,12 @@ describe('docker release workflow context', () => {
       /Verify promoted tags are anonymously pullable[\s\S]*DOCKER_CONFIG="\$\{CLEAN_DOCKER_CONFIG\}" docker pull/
     );
   });
+
+  test('gives the raw integrated image a Docker healthcheck for release smoke tests', () => {
+    const dockerfile = readFileSync(join(repoRoot, 'docker/Dockerfile.integrated'), 'utf8');
+
+    expect(dockerfile).toContain('HEALTHCHECK');
+    expect(dockerfile).toContain('127.0.0.1:3000');
+    expect(dockerfile).toContain('127.0.0.1:8317');
+  });
 });