updated workflows

[ohbus]

Updated Continuous Integration Workflows

• Created a separate job named Java PR Builder for handling Pull Requests
• Added caching of maven dependencies for both the jobs

What's the improvement for having a seperate PR builder?

• PR builder job will not show the build as failing anymore in the readme section badge for a faulty PR.

How is caching going to help?

• Subsequent builds will be much faster reducing overall build time
• All artifacts from the previous build will be cached and need not be downloaded again for building the code.
• It will update the cache if newer dependencies are added to the pom files after completion of the job.

[iluwatar]

Many thanks @ohbus, good improvement 👍🏻

[ohbus]

@iluwatar Thank you so much for guiding me.

Please do mention me if the workflow needs an update.

Thanks.