Change trigger to only run on changes to Docker related files

.github/workflows/docker-image-ci.yml

@@ -3,8 +3,14 @@ name: Docker Image CI
 on:
   push:
     branches: [ master ]
+    paths:
+      - 'Dockerfile'
+      - 'entrypoint.sh'
   pull_request:
     branches: [ master ]
+    paths:
+      - 'Dockerfile'
+      - 'entrypoint.sh' 
 
 jobs:
   lint: