Added cache pip to CI workflows

Author: nir1r7

.github/workflows/ci.yml

@@ -25,6 +25,15 @@ jobs:
               with:
                 python-version: "3.11"
 
+            # Cache pip dependencies
+            - name: Cache pip
+              uses: actions/cache@v4
+              with:
+                path: ~/.cache/pip
+                key: ${{ runner.os }}-pip-${{ hashFiles('backend/requirements.txt') }}
+                restore-keys: |
+                  ${{ runner.os }}-pip
+
             # Install dependencies
             - name: Install dependencies
               run: |