Add ReleaseBranch and MainGitBranch to workflow

This change adds the ReleaseBranch and MainGitBranch environment variables to the deploy-preview-module workflow. This enhancement ensures that the correct branches are referenced during the deployment process for Pester Help Tests.

Thank you!

Author: SQLDBAWithABeard

.github/workflows/deploy-preview-module.yml

@@ -72,3 +72,5 @@ jobs:
       env:
         GitHubToken: ${{ secrets.GitHubToken }}
         GalleryApiToken: ${{ secrets.GalleryApiToken }}
+        ReleaseBranch: develop
+        MainGitBranch: develop