build: rewrite ci

.github/workflows/ci.yml

@@ -1,34 +1,42 @@
-name: 'ci'
-
 on:
-  push:
-    branches: [master]
-  pull_request:
-    branches: [master]
+  pull_request: {}
+  push: {}
 
 jobs:
+  # The ci-matrix job ends up as multiple jobs and therefore as multiple checks.
+  # Each check's name ends up with the node version appended.
+  # If we were to use those checks as required checks, we would have to occasionally bump them.
+  # This job allows us to have a single check that we don't have to bump.
   ci:
-    runs-on: 'ubuntu-latest'
+    needs: ci-matrix
+    runs-on: ubuntu-latest
     steps:
-      - uses: 'actions/checkout@v3'
-
-      - name: 'Use Node.js'
-        uses: 'actions/setup-node@v3'
+      - run: exit 0
+  ci-matrix:
+    needs: get-supported-node-versions
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: ${{ fromJson(needs.get-supported-node-versions.outputs.versions) }}
+    steps:
+      - uses: actions/checkout@v3
         with:
-          node-version: 'lts/*'
-
-      - name: 'Cache Node dependencies'
-        uses: 'actions/[email protected]'
+          fetch-depth: 0 # for commit linting
+      - uses: actions/setup-node@v3
         with:
-          path: '~/.npm'
-          key: ${{ runner.os }}-node-${{ hashFiles('**/package.json') }}
-          restore-keys: |
-            ${{ runner.os }}-node-
-
-      - name: 'Install dependencies'
-        run: 'npm install'
-
+          node-version: ${{ matrix.node-version }}
+      - run: npm --global install npm@latest
+      - run: npm ci
       - uses: wagoid/commitlint-github-action@v5
-
-      - name: 'Run tests'
-        run: 'npm test'
+      - run: npm test
+  get-supported-node-versions:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - id: get
+        run: |
+          set -euxo pipefail
+          active_versions=$(bash get-node-supported-versions.sh)
+          echo "active=$active_versions" >> "$GITHUB_OUTPUT"
+    outputs:
+      versions: ${{ steps.get.outputs.active }}

get-node-supported-versions.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+set -euxo pipefail
+url=https://raw.githubusercontent.com/nodejs/Release/master/schedule.json
+release_schedule=$(curl -s $url)
+today=$(date "+%Y-%m-%d")
+active_versions=$(echo $release_schedule | jq -s "[ .[] | to_entries[] | select(.value.start <= \"$today\" and .value.end >= \"$today\") | .key[1:] ]")
+echo $active_versions