Only test modified roles

closes OSPRH-11820

Signed-off-by: Fabricio Aguiar <[email protected]>

.github/workflows/molecule.yaml

@@ -55,13 +55,25 @@ jobs:
     - uses: actions/setup-python@v5
       with:
         python-version: '3.9'
+    - name: Check whether the role is modified
+      id: check_role
+      run: |
+        if [[ $(git diff --name-only roles | grep "${{ matrix.tested_role }}/") ]]; then
+          echo "modified=true" >> $GITHUB_OUTPUT
+        else
+          echo "modified=false" >> $GITHUB_OUTPUT
+        fi
     - name: Install ansible
+      if: steps.check_role.outputs.modified == 'true'
       run: pip install ansible
     - name: Install collections
+      if: steps.check_role.outputs.modified == 'true'
       run: ansible-galaxy collection install --force -r requirements.yml
     - name: Install molecule deps
+      if: steps.check_role.outputs.modified == 'true'
       run: pip install -r molecule-requirements.txt
     - name: Run molecule test
+      if: steps.check_role.outputs.modified == 'true'
       run: |
         cd $GITHUB_WORKSPACE/roles/${{ matrix.tested_role }}
         molecule test --all