fix (samples): replace sed -i '' with perl -i -pe for Linux/WSL compatibility

[Ben-Dowling]

Fixes #43 - Raised bug to document the issue

Problem

samples/common.sh uses sed -i '' which is macOS-specific syntax. On Linux and WSL this silently fails, leaving pipeline config files (e.g. pipeline_configs/dev_substitutions.json) without the necessary substitutions, causing sample pipelines to fail.

Solution

Replaced sed -i '' with perl -i -pe which performs the same in-place substitution but works cross-platform (macOS, Linux, WSL).

Testing

• Verified on MinGW terminal on Windows using Databricks CLI v0.297.2
• Ran samples/deploy.sh and confirmed substitutions are correctly applied to pipeline config files
• Sample pipeline (Lakeflow Framework - Run 1 - Load and Schema Initialization) runs dependent tasks successfully.