add debug steps to verify GH_TOKEN access and git authentication

Author: BarkinKctp

.github/workflows/build-citus-community-nightlies.yml

@@ -60,9 +60,49 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USER_NAME }}
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
 
+      - name: "Debug: Confirm token can access repos and git auth works"
+        run: |
+          echo "GH_TOKEN present: ${GH_TOKEN:+yes}"
+          echo "GH_TOKEN length: $(echo -n "$GH_TOKEN" | wc -c)"
+          
+          packaging_status=$(curl -s -o /dev/null -w "%{http_code}" -H "Authorization: token $GH_TOKEN" https://api.github.com/repos/citusdata/packaging)
+          echo "packaging repo status: $packaging_status"
+          docker_status=$(curl -s -o /dev/null -w "%{http_code}" -H "Authorization: token $GH_TOKEN" https://api.github.com/repos/citusdata/docker)
+          echo "docker repo status: $docker_status"
+          
+          if [[ "$packaging_status" != "200" ]]; then
+            echo "ERROR: packaging repo access failed with status $packaging_status"
+            exit 1
+          fi
+          if [[ "$docker_status" != "200" ]]; then
+            echo "ERROR: docker repo access failed with status $docker_status"
+            exit 1
+          fi
+          
+          if git ls-remote --exit-code "https://github.com/citusdata/packaging.git" HEAD >/dev/null 2>&1; then
+            echo "git auth (ls-remote) succeeded"
+          else
+            echo "git auth (ls-remote) FAILED"
+            exit 1
+          fi
+
+      - name: "Debug: Verify git config url rewrite is active"
+        run: git config --global --get-regexp url.*insteadOf | sed -E 's@(https://x-access-token:)[^@]*@\1REDACTED@' || true
+
+      - name: "Debug: Test token access from inside container"
+        run: |
+          docker run --rm -e GITHUB_TOKEN="$GH_TOKEN" citus/packaging-test:debian-trixie-all sh -c "curl -s -o /dev/null -w 'Container API status: %{http_code}\n' -H 'Authorization: token \$GITHUB_TOKEN' https://api.github.com/repos/citusdata/packaging"
+
       - name: Clone build branch
         run: git clone -b "${MAIN_BRANCH}" --depth=1 https://github.com/citusdata/packaging.git packaging
 
+      - name: "Debug: Confirm clone succeeded and files are present"
+        run: |
+          echo "packaging dir listing:"
+          ls -la packaging || true
+          echo "templates docker listing:"
+          find packaging -maxdepth 4 -type f -name '*docker*' -print || true
+
       - name: Install package dependencies
         run: sudo apt-get update && sudo apt-get install libcurl4-openssl-dev libssl-dev python3-testresources