fix commit messag'e

action.yml

@@ -30,6 +30,7 @@ runs:
     - name: Set fields
       env:
         input_message: ${{ inputs.message }}
+        commit_message: ${{ github.event.head_commit.message }}
       shell: bash
       if: always()
       id: fields
@@ -44,11 +45,11 @@ runs:
           echo "emoji=large_orange_square" >> $GITHUB_OUTPUT
           echo "color=warning" >> $GITHUB_OUTPUT
         fi
-        if [ ! -z '$input_message' ]; then
+        if [ ! -z $input_message ]; then
           message=$input_message
-        elif [ ! -z '${{ github.event.head_commit.message }}' ]; then 
+        elif [ ! -z $commit_message ]; then
           # get commit message from `push` trigger
-          commit_message=$(echo '${{ github.event.head_commit.message }}' | head -n 1)
+          commit_message=$(echo '$commit_message' | head -n 1)
           message="<https://github.com/${{ inputs.repository }}/commit/${{ github.sha }}|$commit_message>"
         elif git rev-parse --is-inside-git-dir > /dev/null 2>&1; then  
           # get commit message from the current git directory to support `workflow_dispatch` trigger