ci: manual implementation of the diff action

Author: necipallef

.github/workflows/e2e_test_for_prs.yml

@@ -9,6 +9,16 @@ jobs:
     outputs:
       NEED_TO_RUN_TESTS: ${{ steps.decision.outputs.NEED_TO_RUN_TESTS }}
     steps:
+      - name: Get changed files
+        id: testing-behavior
+        run: |
+          git fetch origin {{ GITHUB_BASE_REF }}
+          diff=$(git diff --name-only --diff-filter=AM origin/{{ GITHUB_BASE_REF }}..HEAD | tr '\n' ' ')
+          echo $diff
+          echo "ADDED_MODIFIED=$diff" >> "$GITHUB_OUTPUT"
+          for changed_file in $diff; do
+            echo $changed_file
+          done
       - id: files
         uses: jitterbit/get-changed-files@b17fbb00bdc0c0f63fcf166580804b4d2cdc2a42
       - name: Make decision based on changed files