CI: Run PHP 8.5 CI jobs on Ubuntu 26.04 ARM instead of 24.04 x86/64

This gets us coverage of a different CPU architecture (unlikey to
matter), and of the latest Ubuntu LTS (with MySQL 8.4 vs MySQL 8.0)

Author: bpfoley

.github/actions/setup-mysql-db/action.yml

@@ -3,7 +3,9 @@ runs:
   steps:
     - name: Start mysql service
       shell: bash
-      run: sudo /etc/init.d/mysql start
+      run: |
+        sudo systemctl start mysql.service
+        timeout 30s bash -c 'until mysqladmin ping --silent; do sleep 1; done'
     - name: Configure mysql
       shell: bash
       run: |

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
         cfg:
           - { os: 'ubuntu-24.04', php: '8.3' }
           - { os: 'ubuntu-24.04', php: '8.4' }
-          - { os: 'ubuntu-24.04', php: '8.5' }
+          - { os: 'ubuntu-26.04-arm', php: '8.5' }
     runs-on: ${{ matrix.cfg.os }}
     steps:
       - name: Checkout Code
@@ -41,7 +41,7 @@ jobs:
         cfg:
           - { os: 'ubuntu-24.04', php: '8.3' }
           - { os: 'ubuntu-24.04', php: '8.4' }
-          - { os: 'ubuntu-24.04', php: '8.5' }
+          - { os: 'ubuntu-26.04-arm', php: '8.5' }
     runs-on: ${{ matrix.cfg.os }}
     steps:
       - name: Checkout Code
@@ -110,7 +110,7 @@ jobs:
         cfg:
           - { os: 'ubuntu-24.04', php: '8.3' }
           - { os: 'ubuntu-24.04', php: '8.4' }
-          - { os: 'ubuntu-24.04', php: '8.5' }
+          - { os: 'ubuntu-26.04-arm', php: '8.5' }
     runs-on: ${{ matrix.cfg.os }}
     steps:
       - name: Checkout Code