Use openjdk official docker image in openapi-generator-online

[wing328]

Use openjdk official docker image in openapi-generator-online as travis failed with adoptjdk in publishing docker images

a follow-up PR to #15947

docker build modules/openapi-generator-online/ -t test3

[+] Building 6.8s (9/9) FINISHED                                                                                                                                                                                                            
 => [internal] load build definition from Dockerfile                                                                                                                                                                                   0.1s
 => => transferring dockerfile: 539B                                                                                                                                                                                                   0.0s
 => [internal] load .dockerignore                                                                                                                                                                                                      0.0s
 => => transferring context: 2B                                                                                                                                                                                                        0.0s
 => [internal] load metadata for docker.io/library/openjdk:11                                                                                                                                                                          3.7s
 => [auth] library/openjdk:pull token for registry-1.docker.io                                                                                                                                                                         0.0s
 => [1/3] FROM docker.io/library/openjdk:11@sha256:99bac5bf83633e3c7399aed725c8415e7b569b54e03e4599e580fc9cdb7c21ab                                                                                                                    0.5s
 => => resolve docker.io/library/openjdk:11@sha256:99bac5bf83633e3c7399aed725c8415e7b569b54e03e4599e580fc9cdb7c21ab                                                                                                                    0.0s
 => => sha256:99bac5bf83633e3c7399aed725c8415e7b569b54e03e4599e580fc9cdb7c21ab 1.04kB / 1.04kB                                                                                                                                         0.0s
 => => sha256:e81b7f317654b0f26d3993e014b04bcb29250339b11b9de41e130feecd4cd43c 1.79kB / 1.79kB                                                                                                                                         0.0s
 => => sha256:47a932d998b743b9b0bcce55aa8ede77de94a6a183c8a67dec9d5e3b8ce0faa7 6.26kB / 6.26kB                                                                                                                                         0.0s
 => [internal] load build context                                                                                                                                                                                                      2.2s
 => => transferring context: 43.92MB                                                                                                                                                                                                   2.2s
 => [2/3] WORKDIR /generator                                                                                                                                                                                                           0.1s
 => [3/3] COPY target/openapi-generator-online.jar /generator/openapi-generator-online.jar                                                                                                                                             0.4s
 => exporting to image                                                                                                                                                                                                                 0.2s
 => => exporting layers                                                                                                                                                                                                                0.2s
 => => writing image sha256:60dcee6b793701cab9ad1f00b0d75d930834d7653ca499ab2aa3310b8b3d7edb                                                                                                                                           0.0s
 => => naming to docker.io/library/test3                                                                                                                                                                                               0.0s
➜  openapi-generator7 git:(fix-docker-travis) ✗ docker run test3                                       
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/generator/openapi-generator-online.jar!/BOOT-INF/lib/logback-classic-1.2.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/generator/openapi-generator-online.jar!/BOOT-INF/lib/slf4j-simple-1.7.36.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::               (v2.5.14)

2023-06-30 11:15:24.237  INFO 1 --- [           main] o.o.codegen.online.OpenAPI2SpringBoot    : Starting OpenAPI2SpringBoot v7.0.0-SNAPSHOT using Java 11.0.16 on d1dc90f91fbe with PID 1 (/generator/openapi-generator-online.jar started by root in /generator)
2023-06-30 11:15:24.246  INFO 1 --- [           main] o.o.codegen.online.OpenAPI2SpringBoot    : No active profile set, falling back to 1 default profile: "default"
2023-06-30 11:15:42.472  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2023-06-30 11:15:42.669  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-06-30 11:15:42.679  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.63]
2023-06-30 11:15:43.768  INFO 1 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-06-30 11:15:43.780  INFO 1 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 19135 ms
^C2023-06-30 11:16:07.794  INFO 1 --- [           main] o.s.b.a.w.s.WelcomePageHandlerMapping    : Adding welcome page: class path resource [static/index.html]
2023-06-30 11:16:08.868  WARN 1 --- [           main] o.s.b.a.m.MustacheAutoConfiguration      : Cannot find template location: classpath:/templates/ (please add some templates, check your Mustache configuration, or set spring.mustache.check-template-location=false)
2023-06-30 11:16:10.372  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2023-06-30 11:16:16.739  INFO 1 --- [           main] o.o.codegen.online.OpenAPI2SpringBoot    : Started OpenAPI2SpringBoot in 56.799 seconds (JVM running for 63.113)

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