Merge pull request #21920 from asenyaev:asen/contrib_fork_check

.github/workflows/PR-3.4-U20.yaml

@@ -49,8 +49,8 @@ jobs:
       run: git clone --single-branch --branch ${{ env.TARGET_BRANCH_NAME }} https://github.com/opencv/opencv_extra.git /opencv_extra
     - name: Merge opencv_extra with ${{ env.SOURCE_BRANCH_NAME }} branch
       run: |
-        RET=$(git ls-remote --heads "https://github.com/${{ env.PR_AUTHOR }}/opencv_extra" "${{ env.SOURCE_BRANCH_NAME }}") || true
-        if [[ ! -z "$RET" ]]; then
+        OPENCV_EXTRA_FORK=$(git ls-remote --heads "https://github.com/${{ env.PR_AUTHOR }}/opencv_extra" "${{ env.SOURCE_BRANCH_NAME }}") || true
+        if [[ ! -z "$OPENCV_EXTRA_FORK" ]]; then
           echo "Merge opencv_extra with ${{ env.SOURCE_BRANCH_NAME }} branch"
           cd /opencv_extra
           git config user.email "opencv.ci"
@@ -169,7 +169,19 @@ jobs:
         git config user.name "opencv.ci"
         git pull -v "https://github.com/${{ env.PR_AUTHOR_FORK }}" "${{ env.SOURCE_BRANCH_NAME }}"
     - name: Clone opencv_contrib
-      run: git clone --single-branch --branch ${{ env.TARGET_BRANCH_NAME }} --depth 1 https://github.com/opencv/opencv_contrib.git /opencv_contrib
+      run: git clone --single-branch --branch ${{ env.TARGET_BRANCH_NAME }} https://github.com/opencv/opencv_contrib.git /opencv_contrib
+    - name: Merge opencv_contrib with ${{ env.SOURCE_BRANCH_NAME }} branch
+      run: |
+        OPENCV_CONTRIB_FORK=$(git ls-remote --heads "https://github.com/${{ env.PR_AUTHOR }}/opencv_contrib" "${{ env.SOURCE_BRANCH_NAME }}") || true
+        if [[ ! -z "$OPENCV_CONTRIB_FORK" ]]; then
+          echo "Merge opencv_contrib with ${{ env.SOURCE_BRANCH_NAME }} branch"
+          cd /opencv_contrib
+          git config user.email "opencv.ci"
+          git config user.name "opencv.ci"
+          git pull -v "https://github.com/${{ env.PR_AUTHOR }}/opencv_contrib" "${{ env.SOURCE_BRANCH_NAME }}"
+        else
+          echo "No merge since ${{ env.PR_AUTHOR }}/opencv_contrib does not have branch ${{ env.SOURCE_BRANCH_NAME }}"
+        fi
     - name: Configure OpenCV Contrib
       run: |
         cd /opencv-contrib-build