try

Author: okuzawats

.yamllint

@@ -34,7 +34,6 @@ rules:
     level: warning
   new-lines: enable
   octal-values: disable
-  quoted-strings:
-    quote-type: double
+  quoted-strings: disable
   trailing-spaces: disable
   truthy: disable

action.yml

@@ -37,7 +37,7 @@ runs:
     - name: "set up ruby"
       uses: "ruby/setup-ruby@v1"
     - name: "deprecate task"
-      if: ${{ true }}
+      if: ${{ github.event.inputs.messageType == "task" }}
       run: |
         echo "type is task"
       shell: "sh"