feat: upgraded to node v18, added .nvmrc and updated workflows

.github/workflows/lockfileversion-check.yml

@@ -10,4 +10,4 @@ on:
 
 jobs:
   version-check:
-    uses: openedx/.github/.github/workflows/lockfileversion-check.yml@master
+    uses: openedx/.github/.github/workflows/lockfileversion-check-v3.yml@master

.github/workflows/node-ci.yml

@@ -11,20 +11,16 @@ on:
 jobs:
   tests:
     runs-on: ubuntu-20.04
-    strategy:
-      matrix:
-        node: [16]
+
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
-
+      uses: actions/checkout@v3
+    - name: Setup Nodejs Env
+      run: echo "NODE_VER=`cat .nvmrc`" >> $GITHUB_ENV
     - name: Setup Nodejs
-      uses: actions/setup-node@v1
+      uses: actions/setup-node@v3
       with:
-        node-version: ${{ matrix.node }}
-
-    - name: Setup npm
-      run: npm i -g [email protected]
+        node-version: ${{ env.NODE_VER }}
 
     - name: Install dependencies
       run: npm ci

.nvmrc

@@ -0,0 +1 @@
+18