Fix Dockerfile BUILD_CONFIGURATION environment variable interpolation

[coderabbitai]

Description

The Dockerfile currently uses the literal string 'BUILD_CONFIGURATION' instead of interpolating the environment variable value in the dotnet publish command.

Current Issue

RUN dotnet publish "./OsmoDoc.API.csproj" -c BUILD_CONFIGURATION -o /app/out

Required Fix

RUN dotnet publish "./OsmoDoc.API.csproj" -c $BUILD_CONFIGURATION -o /app/out

Context

This issue was identified during PR review but deferred to a separate PR to keep the current PR focused on the DocumentService to OsmoDoc renaming.

References

• Original PR: refactor: rename to osmodoc and update related configs and docs #38
• Comment: refactor: rename to osmodoc and update related configs and docs #38 (comment)
• Requested by: @osm-Jatin

[osm-Jatin]

Updated this fix in PR: #51