Demo Instructions for Scala ETL Jobs

This demo will compile Scala programs and will build a JAR file. Demo will upload the JAR file to AWS S3. Demo will also create a Databricks cluster on the fly and will install the JAR file and lakeFS libraries. So, additional setup steps are required.
Remove pr_commit_run_databricks_etl_job.yml file from .github/workflows folder in your Git repo.
Upload pr_commit_run_scala_etl_jobs.yml file in lakeFS-samples/01_standalone_examples/databricks-ci-cd/scala_etl_jobs folder to .github/workflows folder in your Git repo.
Create folder scala_etl_jobs in your Git repo.
Upload all files in lakeFS-samples/01_standalone_examples/databricks-ci-cd/scala_etl_jobs folder to scala_etl_jobs folder in your Git repo.
Add following secrets in your Git repo:

AWS Access Key so GitHub Action can upload JAR file to S3 and Databricks cluster can access S3 bucket:
```
AWS_ACCESS_KEY
```
AWS Secret Key so GitHub Action can upload JAR file to S3 and Databricks cluster can access S3 bucket:
```
AWS_SECRET_KEY
```
LakeFS Access Key so Databricks cluster can access lakeFS server:
```
LAKEFS_ACCESS_KEY
```
LakeFS Secret Key so Databricks cluster can access lakeFS server:
```
LAKEFS_SECRET_KEY
```

AWS Region e.g. us-east-1:
```
AWS_REGION
```
AWS S3 bucket name e.g. sample-jars:
```
AWS_BUCKET_FOR_JARS
```
Root folder name in S3 bucket used above e.g. uploaded-jars:
```
AWS_BUCKET_ROOT_FOLDER_FOR_JARS
```

Create a new branch in your Git repository. Select the newly created branch.
Remove the comment from the last 4 lines of code in etl_jobs.scala inside the scala_etl_jobs/src/main/scala/example folder and Commit your changes.
Go to the Pull requests tab in your Git repo, create Pull Request.
Go to the Actions tab in your Git repo. Git Action will start running automatically and validation checks will fail.
Go back to the Code tab in your Git repo and select the branch created in 1st step. Comment back the last 4 lines of code in etl_jobs.scala and Commit your changes.
Go back to the Actions tab in your Git repo. Git Action will start running again and validation checks will pass this time.

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