chore: rename github action job name

Author: pplmx

.github/workflows/ci.yml renamed to .github/workflows/test_custom_action_itself.yml

@@ -8,7 +8,7 @@ on:
     workflow_dispatch:
 
 jobs:
-    setup-custom-action-by-docker:
+    test_custom_action_itself:
         runs-on: ubuntu-latest
         steps:
             -   uses: actions/checkout@v4

README.md

@@ -49,7 +49,7 @@ jobs:
                 uses: pplmx/setup-custom-action-by-docker@v1
 ```
 
-You can also follow [this](.github/workflows/ci.yml).
+You can also follow [this](.github/workflows/test_custom_action_itself.yml).
 
 ## Local Development