chore: import upstream snapshot with attribution

.github/workflows/debug-docker-credentials.yml

@@ -0,0 +1,34 @@
+name: Debug Docker Credentials
+
+on:
+  workflow_dispatch:
+
+jobs:
+  check-docker-user:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check Docker Hub user for API key
+        env:
+          DOCKER_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+          DOCKER_PASSWORD: ${{ secrets.DOCKERHUB_TOKEN }}
+        run: |
+          echo "Fetching JWT from Docker Hub..."
+          RESPONSE=$(curl -s -X POST \
+            -H "Content-Type: application/json" \
+            -d "{\"username\": \"${DOCKER_USERNAME}\", \"password\": \"${DOCKER_PASSWORD}\"}" \
+            https://hub.docker.com/v2/users/login)
+
+          JWT=$(echo "$RESPONSE" | jq -r '.token // empty')
+
+          if [ -z "$JWT" ]; then
+            echo "Login failed. Response:"
+            echo "$RESPONSE" | jq .
+            exit 1
+          fi
+
+          echo "Login successful. Fetching user info..."
+          USER_INFO=$(curl -s -H "Authorization: Bearer $JWT" https://hub.docker.com/v2/user/)
+          echo "Raw response:"
+          echo "$USER_INFO" | jq .
+          echo "Docker Hub account info:"
+          echo "$USER_INFO" | jq '{username: .username, full_name: .full_name, email: .email, company: .company, date_joined: .date_joined}'