wasi-nn: Support multiple TFLite models (#2002)

Remove restrictions:
- Only 1 WASM app at a time
- Only 1 model at a time
   - `graph` and `graph-execution-context` are ignored

Refer to previous document:
e8d718096d/core/iwasm/libraries/wasi-nn/README.md

core/iwasm/libraries/wasi-nn/test/Dockerfile.nvidia-gpu

@@ -1,6 +1,26 @@
 # Copyright (C) 2019 Intel Corporation.  All rights reserved.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+FROM ubuntu:20.04 AS base
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y \
+    cmake build-essential git
+
+WORKDIR /home/wamr
+
+COPY . .
+
+WORKDIR /home/wamr/core/iwasm/libraries/wasi-nn/test/build
+
+RUN cmake \
+  -DWAMR_BUILD_WASI_NN=1 \
+  -DWASI_NN_ENABLE_GPU=1 \
+  ..
+
+RUN make -j $(grep -c ^processor /proc/cpuinfo)
+
 FROM nvidia/cuda:11.3.0-runtime-ubuntu20.04
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
@@ -15,6 +35,6 @@ RUN mkdir -p /etc/OpenCL/vendors && \
 ENV NVIDIA_VISIBLE_DEVICES=all
 ENV NVIDIA_DRIVER_CAPABILITIES=compute,utility
 
-COPY --from=wasi-nn-base /home/wamr/core/iwasm/libraries/wasi-nn/test/build/iwasm /run/iwasm
+COPY --from=base /home/wamr/core/iwasm/libraries/wasi-nn/test/build/iwasm /run/iwasm
 
 ENTRYPOINT [ "/run/iwasm" ]