ci: Update the completed.md file when finished, if needed.

Jenkinsfile

@@ -56,6 +56,13 @@ pipeline {
                     dir ("build/windows/x64/runner/release") {
                         bat 'tar -cvf ../../../../../windows.tgz .'
                     }
+
+                    bat 'rmdir /S /Q build'
+                    bat 'flutter build windows -t lib\\updateTool.dart'
+
+                    bat "build\\windows\\x64\\runner\\release\\pokedex.exe"
+
+                    stash includes: "COMPLETED.md", name: "md"
                 }
             }
             post {
@@ -66,5 +73,30 @@ pipeline {
                 }
             }
         }
+
+        stage ("Update COMPLETED.md") {
+            agent {
+                label "linux"
+            }
+
+            steps {
+                script {
+                    unstash "md"
+                    sh '''
+                    #!/bin/bash
+
+                    git add COMPLETED.md
+                    git commit -m "[BOT] Update completed.md"
+                    git push
+                    '''
+                }
+            }
+
+            post {
+                always {
+                    cleanWs()
+                }
+            }
+        }
     }
 }