venv execution.

action.yml

@@ -36,16 +36,20 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - name: Install Python dependencies
+    - name: Set up Python virtual environment
       shell: bash
       run: |
-        python3 -m pip install --upgrade pip
+        python3 -m venv venv
-        python3 -m pip install -r ${GITHUB_WORKSPACE}/requirements.txt
+        source venv/bin/activate
+        pip install --upgrade pip
+        pip install -r $GITHUB_ACTION_PATH/requirements.txt
+        echo "VENV_PATH=$PWD/venv" >> $GITHUB_ENV
 
     - name: Run git-auto-comment
       shell: bash
       run: |
-        python3 ${GITHUB_WORKSPACE}/git-auto-comment.py
+        source $VENV_PATH/bin/activate
+        python3 $GITHUB_ACTION_PATH/git-auto-comment.py
       env:
         PLATFORM: ${{ inputs.platform }}
         TOKEN: ${{ inputs.token }}