scripts/detectNotUsingGitPush1by1.fsx: fix

scripts/detectNotUsingGitPush1by1.fsx

@@ -1,21 +1,31 @@
 #!/usr/bin/env -S dotnet fsi
 
 open System
+open System.IO
 open System.Net.Http
 open System.Net.Http.Headers
+open System.Text.RegularExpressions
 
 #r "nuget: Fsdk, Version=0.6.0--date20230214-0422.git-1ea6f62"
 open Fsdk
 
+let githubEventPath = Environment.GetEnvironmentVariable "GITHUB_EVENT_PATH"
 
-let gitRepo = Environment.GetEnvironmentVariable "GITHUB_REPOSITORY"
-
-if String.IsNullOrEmpty gitRepo then
+if String.IsNullOrEmpty githubEventPath then
     Console.Error.WriteLine
         "This script is meant to be used only within a GitHubCI pipeline"
 
     Environment.Exit 2
 
+let jsonString = File.ReadAllText(githubEventPath)
+
+let repoRegex =
+    Regex("\"full_name\"\\s*:\\s*\"([^\\s]*)\"", RegexOptions.Compiled)
+
+let gitRepo =
+    (repoRegex.Matches jsonString).[0].Groups.[1]
+        .ToString()
+
 let currentBranch =
     Process
         .Execute(