Using docker image for nuttx spectest (bytecodealliance#2887)

And disable running the nuttx spectest CI every time PR merged since
it will consume too much runners to slow down the other checks.

.github/workflows/build_llvm_libraries.yml

@@ -11,6 +11,9 @@ on:
       arch:
         required: true
         type: string
+      container_image:
+        required: false
+        type: string
     outputs:
       cache_key:
         description: "A cached key of LLVM libraries"
@@ -19,6 +22,10 @@ on:
 jobs:
   build_llvm_libraries:
     runs-on: ${{ inputs.os }}
+    # Using given container image if it is specified.
+    # Otherwise, it will be ignored by the runner.
+    container:
+      image: ${{ inputs.container_image }}
     outputs:
       key: ${{ steps.create_lib_cache_key.outputs.key}}
 
@@ -71,8 +78,9 @@ jobs:
             0-ccache-${{ inputs.os }}
         if: steps.retrieve_llvm_libs.outputs.cache-hit != 'true' && inputs.os == 'ubuntu-22.04'
 
+      # Don't install dependencies if the cache is hit or running in docker container
       - run: sudo apt install -y ccache ninja-build
-        if: steps.retrieve_llvm_libs.outputs.cache-hit != 'true' && startsWith(inputs.os, 'ubuntu')
+        if: steps.retrieve_llvm_libs.outputs.cache-hit != 'true' && startsWith(inputs.os, 'ubuntu') && inputs.container_image == ''
 
       - uses: actions/cache@v3
         with:

.github/workflows/spec_test_on_nuttx.yml

@@ -6,9 +6,10 @@ name: spec test on nuttx
 on:
   pull_request:
     types:
-      - closed
-    branches:
-      - main
+      - opened
+      - synchronize
+    paths:
+      - ".github/workflows/spec_test_on_nuttx.yml"
 
   schedule:
     - cron:  '0 0 * * *'
@@ -27,10 +28,13 @@ jobs:
     with:
       os: "ubuntu-22.04"
       arch: "ARM RISCV AArch64"
+      container_image: ghcr.io/apache/nuttx/apache-nuttx-ci-linux@sha256:4b4cbf0b70512e61ada9cdcb76b97e90ad478b85e4d0774d05a95fa32caa8c39
 
   spec_test_on_qemu:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     needs: [build_llvm_libraries]
+    container:
+      image: ghcr.io/apache/nuttx/apache-nuttx-ci-linux@sha256:4b4cbf0b70512e61ada9cdcb76b97e90ad478b85e4d0774d05a95fa32caa8c39
     strategy:
       matrix:
         target_config: [
@@ -91,32 +95,6 @@ jobs:
             wamr_test_option: { mode: "-t aot -X" }
 
     steps:
-      - name: Install Utilities
-        run: |
-          sudo apt install -y kconfig-frontends-nox genromfs
-
-      - name: Install ARM Compilers
-        if: startsWith(matrix.target_config.config, 'boards/arm')
-        run: |
-          sudo apt install -y gcc-arm-none-eabi
-          wget --quiet https://developer.arm.com/-/media/Files/downloads/gnu/11.2-2022.02/binrel/gcc-arm-11.2-2022.02-x86_64-aarch64-none-elf.tar.xz
-          xz -d gcc-arm-11.2-2022.02-x86_64-aarch64-none-elf.tar.xz
-          tar xf gcc-arm-11.2-2022.02-x86_64-aarch64-none-elf.tar
-          echo "$PWD/gcc-arm-11.2-2022.02-x86_64-aarch64-none-elf/bin" >> $GITHUB_PATH
-
-      - name: Install RISC-V Compilers
-        if: startsWith(matrix.target_config.config, 'boards/risc-v')
-        run: |
-          curl -L https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases/download/v12.3.0-1/xpack-riscv-none-elf-gcc-12.3.0-1-linux-x64.tar.gz > riscv.tar.gz
-          tar xvf riscv.tar.gz
-          echo "$PWD/xpack-riscv-none-elf-gcc-12.3.0-1/bin" >> $GITHUB_PATH
-
-      - name: Install WASI-SDK
-        run: |
-          curl -L https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-19/wasi-sdk-19.0-linux.tar.gz > wasi-sdk.tar.gz
-          tar xvf wasi-sdk.tar.gz
-          sudo mv wasi-sdk-* /opt/wasi-sdk
-
       - name: Checkout NuttX
         uses: actions/checkout@v3
         with:
@@ -190,20 +168,6 @@ jobs:
           tools/configure.sh ${{ matrix.target_config.config }}
           make -j$(nproc)
           echo "firmware=$PWD/nuttx" >> $GITHUB_OUTPUT
-
-      - name: Install QEMU for ARM
-        if: startsWith(matrix.target_config.config, 'boards/arm')
-        run: |
-          curl -L https://github.com/xpack-dev-tools/qemu-arm-xpack/releases/download/v7.1.0-1/xpack-qemu-arm-7.1.0-1-linux-x64.tar.gz > xpack-qemu-arm.tar.gz
-          tar xvf xpack-qemu-arm.tar.gz
-          echo $PWD/xpack-qemu-arm-7.1.0-1/bin >> $GITHUB_PATH
-
-      - name: Install QEMU for RISC-V
-        if: startsWith(matrix.target_config.config, 'boards/risc-v')
-        run: |
-          curl -L https://github.com/xpack-dev-tools/qemu-riscv-xpack/releases/download/v7.1.0-1/xpack-qemu-riscv-7.1.0-1-linux-x64.tar.gz > xpack-qemu-riscv.tar.gz
-          tar xvf xpack-qemu-riscv.tar.gz
-          echo PATH=$PATH:$PWD/xpack-qemu-riscv-7.1.0-1/bin >> $GITHUB_PATH
       
       - name: Test
         run: |