feat: remove gpu support and simplify to cpu-only

Dockerfile

@@ -1,7 +1,5 @@
-ARG VARIANT=cpu
-
-# ---- CPU base ----
-FROM python:3.12-slim AS base-cpu
+# ---- Final stage ----
+FROM python:3.12-slim
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     ffmpeg curl libgl1 libglib2.0-0 \
@@ -11,31 +9,6 @@ COPY requirements-cpu.txt /tmp/requirements-cpu.txt
 COPY requirements.txt /tmp/requirements.txt
 RUN pip install --no-cache-dir -r /tmp/requirements-cpu.txt && rm /tmp/requirements*.txt
 
-# ---- GPU base ----
-FROM nvidia/cuda:12.4.1-cudnn-runtime-ubuntu22.04 AS base-gpu
-
-ENV DEBIAN_FRONTEND=noninteractive
-
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    software-properties-common \
-    && add-apt-repository ppa:deadsnakes/ppa \
-    && apt-get update \
-    && apt-get install -y --no-install-recommends \
-    python3.12 python3.12-venv python3.12-dev \
-    ffmpeg curl libgl1 libglib2.0-0 \
-    && ln -sf /usr/bin/python3.12 /usr/bin/python3 \
-    && ln -sf /usr/bin/python3 /usr/bin/python \
-    && python3 -m ensurepip --upgrade \
-    && python3 -m pip install --no-cache-dir --upgrade pip \
-    && rm -rf /var/lib/apt/lists/*
-
-COPY requirements-gpu.txt /tmp/requirements-gpu.txt
-COPY requirements.txt /tmp/requirements.txt
-RUN pip install --no-cache-dir -r /tmp/requirements-gpu.txt && rm /tmp/requirements*.txt
-
-# ---- Final stage ----
-FROM base-${VARIANT} AS final
-
 # CWD must be the FaceFusion submodule root so resolve_file_paths('facefusion/...')
 # resolves correctly (FaceFusion uses relative paths from CWD internally)
 WORKDIR /app/facefusion-src