Add OpenWebUI Dockerfile

Dockerfile

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+# ---------------------------------------------------------
+# 1️⃣  Use the official OpenWebUI image (latest tag)
+# ---------------------------------------------------------
+FROM ghcr.io/open-webui/open-webui:latest
+
+# ---------------------------------------------------------
+# 2️⃣  Enable the OpenAI‑compatible API (required for /v1/*)
+# ---------------------------------------------------------
+ENV ENABLE_OPENAI_API=true
+
+# ---------------------------------------------------------
+# 3️⃣  (Optional) Expose a different host port – HF will map
+#    the container’s 8080 → the Space’s public URL automatically.
+# ---------------------------------------------------------
+EXPOSE 8080