feat: Add dockerfile to petclinic

[PranshuSrivastava]

Pull Request Template

Description

With the dockerfile and docker-compose file added users can now just run the application using:

sudo docker build -t java-app:1.0 .

keploy record -c "docker compose up" --containerName javaApp --buildDelay 50s

and test it with

keploy test -c "docker compose up" --containerName javaApp --buildDelay 50s --delay 20

## Type of change

Please delete options that are not relevant.

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
- [ ] This change requires a documentation update

## Checklist:

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream modules
- [ ] I have checked my code and corrected any misspellings
- [ ] I have tagged the reviewers in a comment below incase my pull request is ready for a review
- [ ] I have signed the commit message to agree to Developer Certificate of Origin (DCO) (to certify that you wrote or otherwise have the right to submit your contribution to the project.) by adding "--signoff" to my git commit command.

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[gouravkrosx]

LGTM