Cache venv directory instead

.github/workflows/pylint.yaml

@@ -3,21 +3,21 @@ on: [pull_request]
 jobs:
   pylint_job:
     runs-on: ubuntu-latest
-    name: A job to build the decision engine rpm
+    name: A job to run pylint action
     steps:
     - uses: actions/checkout@v2
     - name: Checkout
       uses: actions/checkout@v2
       with:
         path: 'decisionengine'
       id: checkout
-    - name: Cache pip
+    - name: Cache venv
       uses: actions/cache@v1
       with:
-        path: ~/.cache/pip
-        key: ${{ runner.os }}-pip
+        path: ./venv
+        key: ${{ runner.os }}-venv
         restore-keys: |
-          ${{ runner.os }}-pip-
+          ${{ runner.os }}-venv
           ${{ runner.os }}-
     - name: pylint action step
       uses: ./.github/actions/pylint-in-sl7-docker