change how to tell ts compiler target on node 12

Author: t2t2

.github/workflows/build.yml

@@ -39,12 +39,10 @@ jobs:
     runs-on: ubuntu-latest
 
     strategy:
+      fail-fast: false
       matrix:
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
         node-version: [12.x, 14.x, 16.x, 17.x]
-        include:
-          - node-version: 12.x
-            ts-node-compiler-options: '{"target":"es2019"}'
 
     steps:
       - uses: actions/checkout@v2
@@ -54,8 +52,9 @@ jobs:
           node-version: ${{ matrix.node-version }}
           cache: 'npm'
       - run: npm ci
+      - name: Target older ts version for nodejs 12
+        if: matrix.node-version == '12.x'
+        run: echo "TS_NODE_COMPILER_OPTIONS='{\"target":"es2019\"}'" >> $GITHUB_ENV
       - run: npm test
-        env:
-          TS_NODE_COMPILER_OPTIONS: ${{ matrix.ts-node-compiler-options }}
       # Currently broken
       #- run: npm run node-coveralls