Update CI workflow to use latest Ubuntu and optimize dependency installation

- Changed the runner from ubuntu-20.04 to ubuntu-latest for improved compatibility and support.
- Added a container specification to use Ubuntu 20.04.
- Updated the dependency installation process to use non-interactive mode and removed unnecessary package lists to streamline the build process.

Author: Katze719

.github/workflows/build-deno-so.yml

@@ -8,16 +8,22 @@ on:
 jobs:
   build-deno-so:
     name: Build shared library for Deno
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
+
+    container:
+      image: ubuntu:20.04
 
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
 
       - name: Install build dependencies
+        env:
+          DEBIAN_FRONTEND: noninteractive
         run: |
-          sudo apt-get update
-          sudo apt-get install -y ninja-build g++ git
+          apt-get update
+          apt-get install -y --no-install-recommends ninja-build g++ git ca-certificates
+          rm -rf /var/lib/apt/lists/*
 
       - name: Setup CMake >= 3.30
         uses: jwlawson/actions-setup-cmake@v2