CI fails because of Nodejs version change in GH Action's ubuntu image

[rtang03]

"Default Node.JS will be switched to 14.x on all platforms", on Oct 29, 2020. => break CI

• Issue

Even using nvm does not work.

The grpc binary fail to find.

[rtang03]

The grpc binary in CI environment. has problem, since Nov, 2020. The CI environment change the default Nodejs version from v12 to v14

• see Ubuntu-latest workflows will use Ubuntu-20.04 actions/runner-images#1816
• see Native node module grpc_node.node does not have a unique directory name grpc/grpc#10558

This change breaks the CI.

Even we use "setup-node@v2-beta" with nodejs 12; during the Jest unit test, it attempts to use napi = 6 (i.e. Nodejs 14). The grpc binary will translate the {node_api} into "node-v83". I GUESS that there is some configuration in the Github Action docker image, which defines the used of Node 14 (maybe .npmrc, or something else; I did not check).

The error: cannot grpc C++ addon is located at. And, its installation location depends on n_api version
./lib/binding/{node_abi}-{platform}-{arch}.

In order to workaround it, we use nvm to install nodejs v12, and do the monorepo installation. And, then switch to nodejs v14, to rebuild grpc library. After "./lib/binding/node-v83-darwin-x64/grpc_node.node" is create, resume Nodejs v12.

Because Hyperledger Fabric v2.2 client has a strict engine requirement for Nodejs v12.16.1; cannot use Nodejs V14. Don't attempt to upgrade it.

# ci.yaml
          curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.0/install.sh | bash
          export NVM_DIR="$HOME/.nvm"
          [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
          [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"
          nvm --version
          nvm install v12.16.1
          nvm use v12.16.1
          yarn install
          nvm install v14.0.0
          nvm use v14.0.0
          npm rebuild grpc
          nvm use v12.16.1

For debugging purpose, can use below command to find out napi version:

          yarn config list
          npm version
          yarn versions