Added opencv_contrib branch check on Windows

.github/workflows/PR-3.4-W10.yaml

@@ -42,8 +42,8 @@ jobs:
     - name: Merge opencv_extra with ${{ env.SOURCE_BRANCH_NAME }} branch
       shell: bash
       run: |
-        RET=$(git ls-remote --heads "git@github.com:${{ env.PR_AUTHOR }}/opencv_extra" "${{ env.SOURCE_BRANCH_NAME }}") || true
-        if [[ ! -z "$RET" ]]; then
+        OPENCV_EXTRA_FORK=$(git ls-remote --heads "git@github.com:/${{ env.PR_AUTHOR }}/opencv_extra" "${{ env.SOURCE_BRANCH_NAME }}") || true
+        if [[ ! -z "$OPENCV_EXTRA_FORK" ]]; then
           echo "Merge opencv_extra with ${{ env.SOURCE_BRANCH_NAME }} branch"
           cd opencv_extra
           git config user.email "opencv.ci"
@@ -154,6 +154,19 @@ jobs:
         git pull -v "git@github.com:${{ env.PR_AUTHOR_FORK }}" "${{ env.SOURCE_BRANCH_NAME }}"
     - name: Fetch opencv_contrib
       run: cd ${{ github.workspace }} && git clone --single-branch --branch ${{ env.TARGET_BRANCH_NAME }} --reference ${{ env.GIT_CACHE }}\opencv_contrib.git --depth 1 git@github.com:opencv/opencv_contrib.git
+    - name: Merge opencv_contrib with ${{ env.SOURCE_BRANCH_NAME }} branch
+      shell: bash
+      run: |
+        OPENCV_CONTRIB_FORK=$(git ls-remote --heads "git@github.com:${{ env.PR_AUTHOR }}/opencv_contrib" "${{ env.SOURCE_BRANCH_NAME }}") || true
+        if [[ ! -z "$OPENCV_CONTRIB_FORK" ]]; then
+          echo "Merge opencv_contrib with ${{ env.SOURCE_BRANCH_NAME }} branch"
+          cd /opencv_contrib
+          git config user.email "opencv.ci"
+          git config user.name "opencv.ci"
+          git pull -v "git@github.com:${{ 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: |
         mkdir ${{ github.workspace }}\opencv-contrib-build && cd ${{ github.workspace }}\opencv-contrib-build