Merge pull request #75 from Shuyib/Shuyib-patch-3

Update devops.yml

.github/workflows/devops.yml

@@ -1,5 +1,5 @@
 name: CI/CD 
-on: [push]
+on: [push, pull_request]
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -12,6 +12,13 @@ jobs:
       uses: actions/setup-python@v3
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Cache dependencies
+      uses: actions/cache@v3
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-
     - name: Install dependencies
       run: |
         make install