docs: docker optional and mvn clean

Signed-off-by: Akash Jaiswal <akashjaiswal3846@gmail.com>

Author: jaiakash

spring-boot-jwt/Dockerfile

@@ -10,6 +10,9 @@ RUN apt-get update && apt-get install -y maven
 # Copy the current directory contents into the container at /app
 COPY . /app/
 
+# Run mvn clean install
+RUN mvn clean install
+
 # Expose the port the app runs on
 EXPOSE 8080
 

spring-boot-jwt/README.md

@@ -8,7 +8,7 @@ Before getting started, make sure you have the following installed:
 
 - Latest version of JDK
 - Install [Keploy](https://keploy.io/docs/server/installation/)
-- Install [Docker](https://docs.docker.com/engine/install/)
+- Install [Docker](https://docs.docker.com/engine/install/) (if you want to run application in docker).
 - Postman for testing APIs
 
 ## Getting Started