feat: add test matrix to all templates' CI

- have been using this internally for about a year now, so should be
  good to use by general users too
  - the original proposal to add Actions to all templates also suggested
    adding matrix testing, but that didn't make it into the original PR

- support Node 10, 12, and 14, as well as ubuntu, macOS, and windows
  latest
  - add a note in the docs mentioning the test matrix
    - also fix one doc's missing `size-limit` link
      - not sure how that got missed

- add clear names to all jobs and steps as well
  - change some to include the matrix variant that is currently running
  - "Begin CI..." was not really clear, use "Checkout repo" instead

templates/basic/.github/workflows/main.yml

@@ -2,16 +2,22 @@ name: CI
 on: [push]
 jobs:
   build:
-    runs-on: ubuntu-latest
+    name: Build, lint, and test on Node ${{ matrix.node }} and ${{ matrix.os }}
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        node: ['10.x', '12.x', '14.x']
+        os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
-      - name: Begin CI...
+      - name: Checkout repo
         uses: actions/checkout@v2
 
-      - name: Use Node 12
+      - name: Use Node ${{ matrix.node }}
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: ${{ matrix.node }}
 
       - name: Install deps and build (with cache)
         uses: bahmutov/npm-install@v1

templates/basic/README.md

@@ -63,7 +63,7 @@ TSDX uses [Rollup](https://rollupjs.org) as a bundler and generates multiple rol
 
 Two actions are added by default:
 
-- `main` which installs deps w/ cache, lints, tests, and builds on all pushes
+- `main` which installs deps w/ cache, lints, tests, and builds on all pushes against a Node and OS matrix
 - `size` which comments cost comparison of your library on every pull request using [`size-limit`](https://github.com/ai/size-limit)
 
 ## Optimizations

templates/react-with-storybook/.github/workflows/main.yml

@@ -2,16 +2,22 @@ name: CI
 on: [push]
 jobs:
   build:
-    runs-on: ubuntu-latest
+    name: Build, lint, and test on Node ${{ matrix.node }} and ${{ matrix.os }}
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        node: ['10.x', '12.x', '14.x']
+        os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
-      - name: Begin CI...
+      - name: Checkout repo
         uses: actions/checkout@v2
 
-      - name: Use Node 12
+      - name: Use Node ${{ matrix.node }}
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: ${{ matrix.node }}
 
       - name: Install deps and build (with cache)
         uses: bahmutov/npm-install@v1

templates/react-with-storybook/README.md

@@ -103,7 +103,7 @@ TSDX uses [Rollup](https://rollupjs.org) as a bundler and generates multiple rol
 
 Two actions are added by default:
 
-- `main` which runs installs deps w/ cache, lints, tests, and builds on all pushes
+- `main` which installs deps w/ cache, lints, tests, and builds on all pushes against a Node and OS matrix
 - `size` which comments cost comparison of your library on every pull request using [size-limit](https://github.com/ai/size-limit)
 
 ## Optimizations

templates/react/.github/workflows/main.yml

@@ -2,16 +2,22 @@ name: CI
 on: [push]
 jobs:
   build:
-    runs-on: ubuntu-latest
+    name: Build, lint, and test on Node ${{ matrix.node }} and ${{ matrix.os }}
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        node: ['10.x', '12.x', '14.x']
+        os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
-      - name: Begin CI...
+      - name: Checkout repo
         uses: actions/checkout@v2
 
-      - name: Use Node 12
+      - name: Use Node ${{ matrix.node }}
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: ${{ matrix.node }}
 
       - name: Install deps and build (with cache)
         uses: bahmutov/npm-install@v1

templates/react/README.md

@@ -82,8 +82,8 @@ TSDX uses [Rollup](https://rollupjs.org) as a bundler and generates multiple rol
 
 Two actions are added by default:
 
-- `main` which runs installs deps w/ cache, lints, tests, and builds on all pushes
-- `size` which comments cost comparison of your library on every pull request using
+- `main` which installs deps w/ cache, lints, tests, and builds on all pushes against a Node and OS matrix
+- `size` which comments cost comparison of your library on every pull request using [`size-limit`](https://github.com/ai/size-limit)
 
 ## Optimizations