fix(yamlfmt): Use the package's config file.

yamlfmt.yml

@@ -11,26 +11,13 @@ yamlfmt:
     name: registry.gitlab.com/gitlab-com/gl-infra/common-ci-tasks-images/yamlfmt:${GL_ASDF_YAMLFMT_VERSION}
     entrypoint: [""]
   script:
+    # yamlfmt will fail if this file doesn't exist.
+    - touch .yamlfmtignore
     - |
-      # Create default config if .yamlfmt.yaml doesn't exist.
-      if [ ! -e .yamlfmt.yaml ]; then
-        cat >.yamlfmt.yaml <<EOF
-      formatter:
-        type: basic
-        retain_line_breaks_single: true
-        scan_folded_as_literal: true
-        drop_merge_tag: true
-        pad_line_comments: 2
-        eof_newline: true
-      EOF
-        if [ -e .yamlfmtignore ]; then
-          echo "gitignore_path: .yamlfmtignore" >>.yamlfmt.yaml
-          echo "gitignore_excludes: true" >>.yamlfmt.yaml
-        fi
-      fi
-      echo "# .yamlfmt.yaml"
-      cat .yamlfmt.yaml
-    - yamlfmt -conf .yamlfmt.yaml .
+      # Dump yamlfmt config
+      echo "# /etc/yamlfmt.yaml"
+      cat /etc/yamlfmt.yaml
+    - yamlfmt -conf /etc/yamlfmt.yaml .
     - git diff | tee yamlfmt.patch
     - |
       if [ -s yamlfmt.patch ]; then