diff --git a/src/Nocr.TelegramListener.Host/Dockerfile b/src/Nocr.TelegramListener.Host/Dockerfile
index 2a8aedb..72cac05 100644
--- a/src/Nocr.TelegramListener.Host/Dockerfile
+++ b/src/Nocr.TelegramListener.Host/Dockerfile
@@ -18,25 +18,23 @@ RUN apt-get update && \
 
 COPY . .
 
-# Create NuGet.Config using cat with heredoc
+# Create NuGet.Config
 RUN mkdir -p /root/.nuget/NuGet && \
-    cat > /root/.nuget/NuGet/NuGet.Config <<'EOF'
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-  <packageSources>
-    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
-    <add key="musk.fun.nocr" value="https://gitea.musk.fun/api/packages/nocr/nuget/index.json" />
-  </packageSources>
-  <packageSourceMapping>
-    <packageSource key="musk.fun.nocr">
-      <package pattern="Nocr.*" />
-    </packageSource>
-    <packageSource key="nuget.org">
-      <package pattern="*" />
-    </packageSource>
-  </packageSourceMapping>
-</configuration>
-EOF
+    echo '<?xml version="1.0" encoding="utf-8"?>' > /root/.nuget/NuGet/NuGet.Config && \
+    echo '<configuration>' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '  <packageSources>' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '    <add key="musk.fun.nocr" value="https://gitea.musk.fun/api/packages/nocr/nuget/index.json" />' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '  </packageSources>' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '  <packageSourceMapping>' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '    <packageSource key="musk.fun.nocr">' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '      <package pattern="Nocr.*" />' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '    </packageSource>' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '    <packageSource key="nuget.org">' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '      <package pattern="*" />' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '    </packageSource>' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '  </packageSourceMapping>' >> /root/.nuget/NuGet/NuGet.Config && \
+    echo '</configuration>' >> /root/.nuget/NuGet/NuGet.Config
 
 # Publish directly (restore + build + publish in one step)
 WORKDIR "/src/src/Nocr.TelegramListener.Host"