update build image to ubuntu-latest (previous ubuntu-20.04 runner depreciated April 2025)

Author: ccall48

.github/workflows/build-container-image.yml

@@ -12,8 +12,8 @@ on:
 
 jobs:
   docker_publish:
-    runs-on: "ubuntu-20.04"
-
+    # runs-on: "ubuntu-20.04"
+    runs-on: ubuntu-latest
     steps:
       # - uses: actions/checkout@v2
       - uses: actions/checkout@v4