ci: install collection locally to run tests

.gitea/workflows/pull-request-open.yml

@@ -47,18 +47,16 @@ jobs:
         working-directory: ${{ gitea.workspace }}
 
       - name: Setup testing environment
-        run: |
-          mkdir -p /tmp/ansible_collections/ednz_cloud
-          ln -s ${{ gitea.workspace }} /tmp/ansible_collections/ednz_cloud/infomaniak
+        run: ansible-galaxy collection install ${{ gitea.workspace }}
         shell: bash
         working-directory: ${{ gitea.workspace }}
 
       - name: Run ansible unit tests
         run: ansible-test units --coverage
         shell: bash
-        working-directory: /tmp/ansible_collections/ednz_cloud/infomaniak
+        working-directory: ${{ gitea.workspace }}
 
       - name: Print coverage informations
         run: ansible-test coverage report
         shell: bash
-        working-directory: /tmp/ansible_collections/ednz_cloud/infomaniak
+        working-directory: ${{ gitea.workspace }}