attempt a single matrix

.github/workflows/node.js.yml

@@ -10,56 +10,28 @@ on:
 
 jobs:
   test-node:
-    name:
-      # prettier-ignore
-      Test on Node.js v${{ matrix.node-version }} and html-webpack-plugin v${{ matrix.html-plugin-version }}
-    strategy:
-      fail-fast: false
-      matrix:
-        node-version: [6.x, 8.x, 10.x, 12.x, 14.x, 15.x]
-        html-plugin-version: [3, 4]
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-      - name: Get yarn cache directory path
-        id: yarn-cache-dir-path
-        run: echo "::set-output name=dir::$(yarn cache dir)"
-      - uses: actions/cache@v2
-        id: yarn-cache
-        with:
-          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
-          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-yarn-
-      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v2
-        with:
-          node-version: ${{ matrix.node-version }}
-      - name: install with html-webpack-plugin v${{matrix.html-plugin-version }}
-        run: |
-          yarn
-          yarn add --dev html-webpack-plugin@${{matrix.html-plugin-version }}
-          git checkout
-      - name: run tests
-        run: yarn cover
-      - uses: codecov/codecov-action@v1
-        if: ${{ always() }}
-  test-node-webpack-5:
     name:
       # prettier-ignore
       Test on Node.js v${{ matrix.node-version }} and html-webpack-plugin v${{ matrix.html-plugin-version }} and webpack v${{ matrix.webpack-version }}
     strategy:
       fail-fast: false
       matrix:
-        node-version: [10.x, 12.x, 14.x, 15.x]
-        html-plugin-version: [4, 5]
+        node-version: [6.x, 8.x, 10.x, 12.x, 14.x, 15.x]
+        html-plugin-version: [3, 4, 5]
         webpack-version: [4, 5]
         exclude:
+          # plugin@5 only supports webpack@5
           - html-plugin-version: 5
             webpack-version: 4
+          # webpack@5 and plugin@5 does not support node 6 or 8
+          - node-version: 6.x
+            webpack-version: 5
+          - node-version: 6.x
+            html-plugin-version: 5
+          - node-version: 8.x
+            webpack-version: 5
+          - node-version: 8.x
+            html-plugin-version: 5
     runs-on: ubuntu-latest
 
     steps:
@@ -172,7 +144,7 @@ jobs:
       # prettier-ignore
       ${{ github.event_name == 'push' && github.event.ref == 'refs/heads/main' }}
     name: Release new version
-    needs: [lint, test-node, test-node-webpack-5, test-os, test-browser]
+    needs: [lint, test-node, test-os, test-browser]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2