CI: Build and test using .nvmrc node version (#101)

Use the node version specified in .nvmrc

We specify node version 10.22.0 so that CI will let us know if we break our minimum node version with any later changes, even if there are future updates to the 10.x release line.

In other words, this ensures that the minimum version in package.json is always tested by CI, as well as the latest 10.x version.

For example, if a new feature is added in 10.23 and we use it, we want CI to fail so that we know to update the minimum in
package.json.

Co-authored-by: Nathan Nichols <natenichols@cox.net>

packages/ripple-binary-codec/.github/workflows/nodejs.yml

@@ -10,6 +10,24 @@ on:
     branches: [ master ]
 
 jobs:
+  build_with_nvm:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Read .nvmrc # From https://github.com/actions/setup-node/issues/32#issuecomment-525791142
+      run: echo "##[set-output name=NVMRC;]$(cat .nvmrc)"
+      id: nvm
+    - name: Use Node.js (.nvmrc)
+      uses: actions/setup-node@v1
+      with:
+        node-version: "${{ steps.nvm.outputs.NVMRC }}"
+    - run: yarn install
+    - run: yarn run test
+    - run: yarn run lint
+    - run: yarn run compile
+
   build:
 
     runs-on: ubuntu-latest

packages/ripple-binary-codec/.nvmrc

@@ -1 +1 @@
-12
+10.22.0

packages/ripple-binary-codec/package.json

@@ -51,7 +51,7 @@
     "semi": true
   },
   "engines": {
-    "node": ">=10.22",
+    "node": ">=10.22.0",
     "yarn": "^1.22.4"
   }
 }