PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\. If contributing template-only or documentation-only changes which will change sample output, be sure to build the project first.
• Filed the PR against the correct branch: master, 4.1.x, 5.0.x. Default: master.
• Copied the technical committee to review the pull request if your PR is targeting a particular programming language.

Related PR: #3901

Description of the PR

This PR is updating the Quarkus version in the OpenAPI-Generator template and doing some additional changes to the Docker templates.

The idea is that the code generated by the Quarkus tooling:

mvn io.quarkus:quarkus-maven-plugin:0.23.2:create \
  -DprojectGroupId=org.openapitools \
  -DprojectArtifactId=openapi-jaxrs-server \
  -DclassName="org.openapi.openapitools.PingApi" \
  -Dpath="/ping" \
  -Dextensions="smallrye-openapi"

Must be similar to what is generated with OpenAPI generator:

JavaJAXRSSpecServerCodegen config = new JavaJAXRSSpecServerCodegen();
config.setHideGenerationTimestamp(true);
config.setOutputDir(outputDirPath.toFile()
        .getCanonicalPath());
config.setLibrary(JavaJAXRSSpecServerCodegen.QUARKUS_LIBRARY);
config.setArtifactVersion("1.0-SNAPSHOT");

final OpenAPIV3Parser openApiParser = new OpenAPIV3Parser();
final ParseOptions options = new ParseOptions();
options.setFlatten(true);
options.setResolve(true);
final OpenAPI openAPI = openApiParser.read("openapi/" + inputSpecName, null, options);

final ClientOptInput opts = new ClientOptInput()
        .config(config)
        .openAPI(openAPI);
new DefaultGenerator().opts(opts)
        .generate();