Change Dockerfile.git to -alpine / upgrade Ubuntu

Author: drwetter

.github/workflows/unit_tests.yml

@@ -12,7 +12,7 @@ on:
       - '**.html'
       - 'LICENSE'
       - 'Dockerfile'
-      - 'Dockerfile.git'
+      - 'Dockerfile-alpine'
 
 permissions:
   contents: read
@@ -22,7 +22,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: ['ubuntu-22.04']
+        os: ['ubuntu-24.04']
         perl: ['5.26']
     name: Perl ${{ matrix.perl }} on ${{ matrix.os }}
     steps: