GH Actions: WordPress + BuddyPress test environment

tests.yml

name: Tests

on: [ push ]

jobs:
  tests:

    runs-on: ubuntu-20.04
    if: "!contains(github.event.head_commit.message, '[skip ci]')"

    strategy:
      matrix:
        wp-versions: [ 5.6 ]
        php-versions: [ 7.4 ]

    name: WP ${{ matrix.wp-versions }} on PHP ${{ matrix.php-versions }}

    env:
      php-ini-values: post_max_size=256M
      wp-bp-directory: src/wp-content/plugins/buddypress
      DB_DATABASE: wordpress_test
      DB_USER: root
      DB_PASSWORD: 'root'
      DB_HOST: localhost

    steps:
      - run: |
          sudo /etc/init.d/mysql start
          mysql -e 'CREATE DATABASE wordpress_test;' -uroot -proot
          mysql -e 'SHOW DATABASES;' -uroot -proot
      - name: Cancel previous runs of this workflow
        uses: styfle/cancel-workflow-action@0.6.0
        with:
          access_token: ${{ github.token }}

      - name: Checkout WordPress
        uses: actions/checkout@v2
        with:
          repository: WordPress/wordpress-develop
          ref: ${{ matrix.wp-versions }}
          path: ''

      - name: Checkout BuddyPress
        uses: actions/checkout@v2
        with:
          path: ${{ env.wp-bp-directory }}

      - name: Setup PHP
        uses: shivammathur/setup-php@v2
        with:
          tools: pecl
          php-version: ${{ matrix.php-versions }}
          ini-values: ${{ env.php-ini-values }}
        env:
          update: true

      - name: Get Composer cache directory
        working-directory: ${{ env.wp-bp-directory }}
        id: composer-cache
        run: echo "::set-output name=dir::$(composer config cache-files-dir)"

      - name: Cache Composer dependencies
        uses: actions/cache@v1
        with:
          path: ${{ steps.composer-cache.outputs.dir }}
          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
          restore-keys: ${{ runner.os }}-composer-

      - name: Install Composer dependencies
        working-directory: ${{ env.wp-bp-directory }}
        run: composer install -q --prefer-dist --no-progress --ansi --no-interaction --no-suggest

      - name: Install NodeJS
        uses: actions/setup-node@v1
        with:
          node-version: 12.16.0

      - name: Cache NodeJS modules
        uses: actions/cache@v2
        env:
          cache-name: cache-node-modules
        with:
          path: ~/.npm
          key: ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}
          restore-keys: |
            ${{ runner.os }}-npm-
      - name: Install Node dependencies
        working-directory: ${{ env.wp-bp-directory }}
        run: npm ci

      - name: Install phpunit 5.x on PHP 5.6
        if: ${{ matrix.php-versions == '5.6' }}
        run: |
          composer global require --dev phpunit/phpunit ^5 -q --prefer-dist --no-progress --ansi --no-interaction --no-suggest
          phpunit --version
      - name: Install phpunit 6.x on PHP 7.4
        if: ${{ matrix.php-versions == '7.4' }}
        run: |
          composer global require --dev phpunit/phpunit ^6 -q --prefer-dist --no-progress --ansi --no-interaction --no-suggest
          phpunit --version
      - name: Set up tests config
        run: |
          cp wp-tests-config-sample.php wp-tests-config.php
          sed -i "s/youremptytestdbnamehere/${{ env.DB_DATABASE }}/" wp-tests-config.php
          sed -i "s/yourusernamehere/${{ env.DB_USER }}/" wp-tests-config.php
          sed -i "s/yourpasswordhere/${{ env.DB_PASSWORD }}/" wp-tests-config.php
          sed -i "s/localhost/${{ env.DB_HOST }}:${{ job.services.mysql.ports['3306'] }}/" wp-tests-config.php
      - name: Upload build artifact (TEMP)
        uses: actions/upload-artifact@v2
        with:
          name: wp-${{ matrix.wp-versions }}-php-${{ matrix.php-versions }}
          path: wp-tests-config.php

      - name: Run phpunit tests
        working-directory: ${{ env.wp-bp-directory }}
        run: phpunit

I have this error

Run sudo /etc/init.d/mysql start
  
Starting mysql (via systemctl): mysql.service.
Warning: arning] Using a password on the command line interface can be insecure.
ERROR 2005 (HY000): Unknown MySQL server host 'mysql8' (-3)
Error: Process completed with exit code 1.