introduce options to choose a bundle strategy

Pick from 'none', 'keycloakify' or 'mvn', default to 'mvn'. 'none' will
not create a jar, 'keycloakify' will create a jar file using only tools
available to native nodejs, no additional  system library required.
Choosing 'mvn' will behave as before, starting maven in a subprocess.

The bundler can be chosen in `package.json` or via `KEYCLOAKIFY_BUNDLER`
env var.

This commit also adds `KEYCLOAKIFY_GROUP_ID` and
`KEYCLOAKIFY_ARTIFACT_ID` env vars, which will be used to
define group id and artifact id in pom.xml and pom.properties, if given.

src/bin/keycloakify/keycloakify.ts

@@ -7,6 +7,7 @@ import * as fs from "fs";
 import { readBuildOptions } from "./BuildOptions";
 import { getLogger } from "../tools/logger";
 import { getCliOptions } from "../tools/cliOptions";
+import jar from "../tools/jar";
 
 const reactProjectDirPath = process.cwd();
 
@@ -45,17 +46,30 @@ export async function main() {
     });
 
     const { jarFilePath } = generateJavaStackFiles({
-        "version": buildOptions.version,
         keycloakThemeBuildingDirPath,
         doBundlesEmailTemplate,
         buildOptions
     });
 
-    child_process.execSync("mvn package", {
-        "cwd": keycloakThemeBuildingDirPath
-    });
+    if (buildOptions.bundler === "none") {
+        logger.log("😱 Skipping bundling step, there will be no jar");
+    } else if (buildOptions.bundler === "keycloakify") {
+        logger.log("🫶 Let keycloakify do its thang");
+        await jar({
+            "rootPath": keycloakThemeBuildingDirPath,
+            "version": buildOptions.version,
+            "groupId": buildOptions.groupId,
+            "artifactId": buildOptions.artifactId || `${buildOptions.themeName}-keycloak-theme`,
+            "targetPath": jarFilePath
+        });
+    } else {
+        logger.log("🫙 Run maven to deliver a jar");
+        child_process.execSync("mvn package", {
+            "cwd": keycloakThemeBuildingDirPath
+        });
+    }
 
-    //We want, however, to test in a container running the latest Keycloak version
+    // We want, however, to test in a container running the latest Keycloak version
     const containerKeycloakVersion = "20.0.1";
 
     generateStartKeycloakTestingContainer({