Remove alpine from CI build pipeline

Author: andrewdalpino

.github/workflows/ci-ext.yml

@@ -22,13 +22,9 @@ jobs:
       matrix:
         image:
           - php:8.0-cli
-          - php:8.0-cli-alpine
           - php:8.1-cli
-          - php:8.1-cli-alpine
           - php:8.2-cli
-          - php:8.2-cli-alpine
           - php:8.3-cli
-          - php:8.3-cli-alpine
 
     name: Image ${{ matrix.image }}
     runs-on: ubuntu-latest