Make Docker actions conditional on ultralytics/yolov5 repo (#8060)

* Update ci-testing.yml

* Update ci-testing.yml

* Update ci-testing.yml

* Update docker.yml

.github/workflows/docker.yml

@@ -1,15 +1,15 @@
 # YOLOv5 🚀 by Ultralytics, GPL-3.0 license
+# Builds ultralytics/yolov5:latest images on DockerHub https://hub.docker.com/r/ultralytics/yolov5
 
 name: Publish Docker Images
 
 on:
   push:
     branches: [ master ]
-  # pull_request:
-  #   branches: [master]
 
 jobs:
   docker:
+    if: github.repository == 'ultralytics/yolov5'
     name: Push Docker image to Docker Hub
     runs-on: ubuntu-latest
     steps: