Update DOCS

docs/faqs/How to build a PROD jar.md

@@ -13,11 +13,23 @@ npm install
 npm run build
 ```
 
-- Build and package JAR
+- OR:Build and package JAR
 
 ```bash
 mvnw -Pprod clean verify
 ```
 
+- OR:Build and package JAR WITHOUT tests
+
+```bash
+mvnw -Pprod clean verify -DskipTests -Dmaven.test.skip=true
+```
+
 ---
 
+**B:** The result is a JAR generated in : target/
+
+**C:** Things to validate
+
+- In target/classes a static/ must exist, after the "Build front-end (Angular)"
+- Check for BOOT-INF/classes/static dir in the generated JAR file