CI: update conflicts check to support yml and yaml files (#854)

* update conflicts check and add test file

* delete test file

.github/workflows/ci.yaml

@@ -7,7 +7,7 @@ jobs:
   pull:
     runs-on: ubuntu-latest
     steps:
-    - name: Check out 
+    - name: Check out
       uses: actions/checkout@v2
     - uses: actions/setup-node@v1
       with:
@@ -16,7 +16,7 @@ jobs:
       run:
         git remote add upstream https://github.com/pingcap/docs-tidb-operator.git;
         git fetch upstream;
-        python3 ./hack/check-conflicts.py $(git diff-tree --name-only --no-commit-id -r upstream/master...HEAD -- 'zh/' 'en/' '.md' ':(exclude).github/*')
+        python3 ./hack/check-conflicts.py $(git diff-tree --name-only --no-commit-id -r upstream/master...HEAD -- '*.md' '*.yml' '*.yaml')
     - name: Markdown lint
       uses: avto-dev/markdown-lint@v1
       with:
@@ -25,8 +25,8 @@ jobs:
     - name: Verify internal links
       run: ./hack/verify-links.sh
     - name: Verify internal link anchors
-      run: ./hack/verify-link-anchors.sh 
+      run: ./hack/verify-link-anchors.sh
     - name: "Check unclosed tags"
-      run: 
+      run:
         echo "checked files are $(git diff-tree --name-only --no-commit-id -r upstream/master...HEAD -- 'zh/' 'en/' '.md' ':(exclude).github/*')";
         python3 ./hack/check-tags.py $(git diff-tree --name-only --no-commit-id -r upstream/master...HEAD -- 'zh/' 'en/' '.md' ':(exclude).github/*')