Fix DockerBuild.ps1 placeholders not being replaced

The previous commit incorrectly copied the template file with <ENG_PATH>
and <ENVIRONMENT_VARIABLES> placeholders instead of the generated values.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: gfraiteur

DockerBuild.ps1

@@ -28,8 +28,8 @@ param(
 
 ####
 # These settings are replaced by the generate-scripts command.
-$EngPath = '<ENG_PATH>'
-$EnvironmentVariables = '<ENVIRONMENT_VARIABLES>'
+$EngPath = 'eng'
+$EnvironmentVariables = 'AWS_ACCESS_KEY_ID,AWS_SECRET_ACCESS_KEY,AZ_IDENTITY_USERNAME,AZURE_CLIENT_ID,AZURE_CLIENT_SECRET,AZURE_DEVOPS_TOKEN,AZURE_DEVOPS_USER,AZURE_TENANT_ID,DOC_API_KEY,DOWNLOADS_API_KEY,ENG_USERNAME,GIT_USER_EMAIL,GIT_USER_NAME,GITHUB_AUTHOR_EMAIL,GITHUB_REVIEWER_TOKEN,GITHUB_TOKEN,IS_POSTSHARP_OWNED,IS_TEAMCITY_AGENT,MetalamaLicense,NUGET_ORG_API_KEY,PostSharpLicense,SIGNSERVER_SECRET,TEAMCITY_CLOUD_TOKEN,TYPESENSE_API_KEY,VS_MARKETPLACE_ACCESS_TOKEN,VSS_NUGET_EXTERNAL_FEED_ENDPOINTS'
 ####
 
 $ErrorActionPreference = "Stop"