cashe after intall or Rocoto silly

.github/workflows/ci-unit_tests.yaml

@@ -28,12 +28,6 @@ jobs:
           # If you have a requirements.txt file, you can install all dependencies using:
           # pip install -r requirements.txt
 
-      - name: Cache Rocoto
-        uses: actions/cache@v4
-        with:
-          path: ~/rocoto
-          key: ${{ runner.os }}-rocoto-${{ hashFiles('**/ci-unit_tests.yaml') }}
-
       - name: Install Rocoto
         run: |
           if [ ! -d "$HOME/rocoto" ]; then
@@ -43,6 +37,12 @@ jobs:
           fi
           echo "$HOME/rocoto/bin" >> $GITHUB_PATH
 
+      - name: Cache Rocoto
+        uses: actions/cache@v4
+        with:
+          path: ~/rocoto
+          key: ${{ runner.os }}-rocoto-${{ hashFiles('**/ci-unit_tests.yaml') }}
+
       - name: Run tests
         run: python -m pytest ci/scripts/tests/test_rocotostat.py -v --junitxml ci/scripts/tests/test-results.xml