Added example rollback scripts

[molivasdat]

Environment

Liquibase Version: 4.7.0 but any

Liquibase Integration & Version: NA

Liquibase Extension(s) & Version: NA

Database Vendor & Version: H2

Operating System Type & Version: Any

Pull Request Type

• Bug fix (non-breaking change which fixes an issue.)
• Enhancement/New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

When running the examples with the example-changelog.sql you cannot rollback your changes.
This enhancement allows you to see the example scripts you would use to rollback your changes and allows you to use the rollback commands with this changelog. Also helps the init project

Steps To Reproduce

Use the example example-changelog.sql in the examples/sql directory of liquibase binary install
Run liquibase --changeLogFile=examples/sql/example-changelog.sql update
Run liquibase rollbackCount 3 or any other rollback command.
Error occurs

Rolling Back Changeset:example-changelog.sql::3::other.dev
Unexpected error running Liquibase: No inverse to liquibase.change.core.RawSQLChange created
For more information, please use the --log-level flag

Actual Behavior

Error occurs because there is no rollback command specified with .sql type changes out of the box.

Expected/Desired Behavior

Rollbacks work just fine and is successful with:

Rolling Back Changeset:example-changelog.sql::3::other.dev
Rolling Back Changeset:example-changelog.sql::2::your.name
Rolling Back Changeset:example-changelog.sql::1::your.name

Screenshots (if appropriate)

If applicable, add screenshots to help explain your problem.

Additional Context

Add any other context about the problem here.

Fast Track PR Acceptance Checklist:

• Build is successful and all new and existing tests pass
• Added Unit Test(s)
• Added Integration Test(s)
• Added Test Harness Test(s)
• Documentation Updated

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Dev Handoff Notes (Internal Use)

Links

• Fixed Issue: Stand alone PR
• Test Results: https://github.com/liquibase/liquibase/pull/2367/checks

Testing

• Steps to Reproduce: See above
• Guidance:
  • Impact: only changes example files

Dev Verification

Code reviewed only

┆Issue is synchronized with this Jira Bug by Unito

[mariochampion]

looks good to me