chore: switch internal node version to 18, add asdf to docs

Author: escapedcat

.github/workflows/CI.yml

@@ -6,7 +6,7 @@ jobs:
   v14:
     runs-on: ubuntu-22.04
     container:
-      image: "ubuntu:22.04"
+      image: 'ubuntu:22.04'
     steps:
       - name: Install required dependencies
         run: |
@@ -35,7 +35,7 @@ jobs:
   v16:
     runs-on: ubuntu-22.04
     container:
-      image: "ubuntu:22.04"
+      image: 'ubuntu:22.04'
     steps:
       - name: Install required dependencies
         run: |
@@ -64,7 +64,7 @@ jobs:
   v18:
     runs-on: ubuntu-22.04
     container:
-      image: "ubuntu:22.04"
+      image: 'ubuntu:22.04'
     steps:
       - name: Install required dependencies
         run: |
@@ -90,6 +90,35 @@ jobs:
       - name: Test
         run: yarn test-ci
 
+  v20:
+    runs-on: ubuntu-22.04
+    container:
+      image: 'ubuntu:22.04'
+    steps:
+      - name: Install required dependencies
+        run: |
+          apt update
+          apt install --yes sudo
+          sudo apt install --yes git
+          sudo apt install --yes curl
+          curl --location https://deb.nodesource.com/setup_20.x | sudo --preserve-env bash -
+          sudo DEBIAN_FRONTEND=noninteractive apt install --yes nodejs
+      - uses: actions/checkout@v3
+      # workaround for https://github.com/actions/runner/issues/2033
+      - name: ownership workaround
+        run: git config --global --add safe.directory '*'
+      - name: Install yarn
+        run: |
+          npm install --global yarn
+          node --version
+          yarn global add yarn@latest
+      - name: Install dependencies
+        run: yarn install --ignore-engines --frozen-lockfile
+      - name: Build packages
+        run: yarn build
+      - name: Test
+        run: yarn test-ci
+
   windows:
     runs-on: windows-2022
     steps:

.nvmrc

@@ -1 +1 @@
-16
+18

.tool-versions

@@ -0,0 +1 @@
+nodejs 18.16.0

README.md

@@ -260,6 +260,9 @@ npm login
 nvm use (if you have nvm installed)
 ```
 
+- [nvm](https://github.com/nvm-sh/nvm)
+- [asdf](https://asdf-vm.com/) is supported as well
+
 ```sh
 yarn clean
 yarn install