Add Docker push script and registry documentation

- Create scripts/docker-push.sh for building and pushing images
- Add Docker Registry section to README with usage instructions
- Configure for Docker Hub (julienfroidefond32)

scripts/docker-push.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+set -e
+
+# Docker Hub
+REGISTRY="docker.io"
+OWNER="julienfroidefond32"
+VERSION=$(grep '^version = ' Cargo.toml | head -1 | sed 's/version = "\(.*\)"/\1/')
+
+SERVICES=("api" "indexer" "backoffice")
+
+echo "=== Stripstream Librarian Docker Push ==="
+echo "Registry: $REGISTRY"
+echo "Version: $VERSION"
+echo "Services: ${SERVICES[@]}"
+echo ""
+
+for service in "${SERVICES[@]}"; do
+    echo "Building $service..."
+    docker build -f apps/$service/Dockerfile -t $service:latest .
+    
+    echo "Tagging $service..."
+    docker tag $service:latest $REGISTRY/$OWNER/stripstream-$service:$VERSION
+    docker tag $service:latest $REGISTRY/$OWNER/stripstream-$service:latest
+    
+    echo "Pushing stripstream-$service:$VERSION..."
+    docker push $REGISTRY/$OWNER/stripstream-$service:$VERSION
+    
+    echo "Pushing stripstream-$service:latest..."
+    docker push $REGISTRY/$OWNER/stripstream-$service:latest
+    
+    echo "✓ $service pushed successfully"
+    echo ""
+done
+
+echo "=== All images pushed to $REGISTRY ==="
+echo "Images:"
+for service in "${SERVICES[@]}"; do
+    echo "  - $REGISTRY/$OWNER/stripstream-$service:$VERSION"
+    echo "  - $REGISTRY/$OWNER/stripstream-$service:latest"
+done