Fix Docker Multiplatform Build Typo Issue

[mikaelweave]

Description

ADO pipelines print a "true" boolean as "True" so we need to change the case comparison to be case insensitive.

Related issues

AB#135348

Testing

https://microsofthealthoss.visualstudio.com/FhirServer/_build/results?buildId=42992&view=results

FHIR Team Checklist

• Update the title of the PR to be succinct and less than 65 characters
• Add a milestone to the PR for the sprint that it is merged (i.e. add S47)
• Tag the PR with the type of update: Bug, Build, Dependencies, Enhancement, New-Feature or Documentation
• Tag the PR with Open source, Azure API for FHIR (CosmosDB or common code) or Azure Healthcare APIs (SQL or common code) to specify where this change is intended to be released.
• Tag the PR with Schema Version backward compatible or Schema Version backward incompatible or Schema Version unchanged if this adds or updates Sql script which is/is not backward compatible with the code.
• CI is green before merge
• Review squash-merge requirements

Semver Change (docs)

Patch|Skip|Feature|Breaking (reason)

[mikaelweave]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).