add a dev container to WAMR repo

- in vscode, open the workspace in container with *Remote-Containers*
- in codespaces, codespaces will create a container

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.195.0/containers/cpp/.devcontainer/base.Dockerfile
+# [Choice] Debian / Ubuntu version (use Debian 11/9, Ubuntu 18.04/21.04 on local arm64/Apple Silicon): debian-11, debian-10, debian-9, ubuntu-21.04, ubuntu-20.04, ubuntu-18.04
+ARG VARIANT=ubuntu-20.04
+FROM mcr.microsoft.com/vscode/devcontainers/cpp:0-${VARIANT}
+
+ARG DEBIAN_FRONTEND=noninteractive
+ENV TZ=Asian/Shanghai
+
+RUN apt update \
+  && apt install -y apt-transport-https apt-utils build-essential \
+  ca-certificates curl g++-multilib git gnupg \
+  libgcc-9-dev lib32gcc-9-dev lsb-release \
+  ninja-build ocaml ocamlbuild python2.7 \
+  software-properties-common tree tzdata \
+  unzip valgrind vim wget zip
+
+#
+# CMAKE (https://apt.kitware.com/)
+RUN wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | gpg --dearmor - | tee /usr/share/keyrings/kitware-archive-keyring.gpg > /dev/null \
+  && echo 'deb [signed-by=/usr/share/keyrings/kitware-archive-keyring.gpg] https://apt.kitware.com/ubuntu/ bionic main' | tee /etc/apt/sources.list.d/kitware.list >/dev/null \
+  && apt update \
+  && rm /usr/share/keyrings/kitware-archive-keyring.gpg \
+  && apt install -y kitware-archive-keyring \
+  && apt install -y cmake
+
+#
+# install emsdk
+RUN cd /opt \
+  && git clone https://github.com/emscripten-core/emsdk.git
+RUN cd /opt/emsdk \
+  && git pull \
+  && ./emsdk install 2.0.26 \
+  && ./emsdk activate 2.0.26 \
+  && echo "source /opt/emsdk/emsdk_env.sh" >> /root/.bashrc
+
+#
+# install wasi-sdk
+ARG WASI_SDK_VER=16
+RUN wget -c https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-${WASI_SDK_VER}/wasi-sdk-${WASI_SDK_VER}.0-linux.tar.gz -P /opt
+RUN tar xf /opt/wasi-sdk-${WASI_SDK_VER}.0-linux.tar.gz -C /opt \
+  && ln -fs /opt/wasi-sdk-${WASI_SDK_VER}.0 /opt/wasi-sdk
+RUN rm /opt/wasi-sdk-${WASI_SDK_VER}.0-linux.tar.gz
+
+#
+#install wabt
+ARG WABT_VER=1.0.29
+RUN wget -c https://github.com/WebAssembly/wabt/releases/download/${WABT_VER}/wabt-${WABT_VER}-ubuntu.tar.gz -P /opt
+RUN tar xf /opt/wabt-${WABT_VER}-ubuntu.tar.gz -C /opt \
+  && ln -fs /opt/wabt-${WABT_VER} /opt/wabt
+RUN rm /opt/wabt-${WABT_VER}-ubuntu.tar.gz
+
+#
+# install bazelisk
+ARG BAZELISK_VER=1.12.0
+RUN mkdir /opt/bazelisk
+RUN wget -c https://github.com/bazelbuild/bazelisk/releases/download/v${BAZELISK_VER}/bazelisk-linux-amd64 -P /opt/bazelisk
+RUN chmod a+x /opt/bazelisk/bazelisk-linux-amd64 \
+  && ln -fs /opt/bazelisk/bazelisk-linux-amd64 /opt/bazelisk/bazel
+
+#
+# install clang+llvm
+RUN cd /etc/apt/apt.conf.d \
+  && touch 99verfiy-peer.conf \
+  && echo "Acquire { https::Verify-Peer false }" > 99verfiy-peer.conf
+RUN cd /tmp \
+  && wget https://apt.llvm.org/llvm.sh \
+  && chmod a+x ./llvm.sh
+RUN /tmp/llvm.sh 12 all
+
+#
+# [Optional]
+
+#
+# Install pip
+RUN apt update && apt install -y --reinstall python3-venv python3-pip
+RUN python3 -m pip install --upgrade pip
+
+# set path
+ENV PATH "/opt/bazelisk:/opt/clang-llvm/bin:${PATH}"
+RUN echo "export PATH=/opt/bazelisk:/opt/clang-llvm/bin:${PATH}" >> /root/.bashrc
+
+#
+# PS
+RUN echo "PS1='\n[ \u@wamr-dev-docker \W ]\n$ '" >> /root/.bashrc
+
+# Clean up
+RUN apt-get autoremove -y \
+  && apt-get clean -y \
+  && rm -rf /var/lib/apt/lists/* \
+  && rm -rf /tmp/*

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/vscode-remote/devcontainer.json or this file's README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.195.0/containers/cpp
+{
+  "name": "WAMR-Dev",
+  "build": {
+    "dockerfile": "Dockerfile",
+    // Update 'VARIANT' to pick an Debian / Ubuntu OS version: debian-11, debian-10, debian-9, ubuntu-21.04, ubuntu-20.04, ubuntu-18.04
+    // Use Debian 11, Debian 9, Ubuntu 18.04 or Ubuntu 21.04 on local arm64/Apple Silicon
+    "args": { "VARIANT": "ubuntu-20.04" }
+  },
+  "runArgs": ["--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined"],
+
+  // Configure tool-specific properties.
+  "customizations": {
+    // Configure properties specific to VS Code.
+    "vscode": {
+      // Set *default* container specific settings.json values on container create.
+      "settings": {},
+
+      // Add the IDs of extensions you want installed when the container is created.
+      "extensions": [
+        "dtsvet.vscode-wasm",
+        "esbenp.prettier-vscode",
+        "ms-python.python",
+        "ms-python.vscode-pylance",
+        "ms-vscode.cmake-tools",
+        "ms-vscode.cpptools",
+        "twxs.cmake"
+      ]
+    }
+  },
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  // "forwardPorts": [],
+
+  // Use 'postCreateCommand' to run commands after the container is created.
+  "postCreateCommand": "curl https://sh.rustup.rs -sSf | bash -s -- -y",
+
+  // Comment out this line to run as root instead.
+  "remoteUser": "vscode"
+}