ci: upgrade ubuntu base image

Author: yeshan333

.github/workflows/e2e_test_linux.yaml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         # ref: https://github.com/actions/runner-images
-        os: [ubuntu-20.04, ubuntu-22.04, ubuntu-24.04]
+        os: [ubuntu-22.04, ubuntu-24.04]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4

.github/workflows/e2e_test_linux_prebuilt.yaml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         # ref: https://github.com/actions/runner-images
-        os: [ubuntu-20.04]
+        os: [ubuntu-22.04]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
@@ -36,7 +36,7 @@ jobs:
       - name: install Erlang/OTP by vfox-erlang plugin (Linux)
         run: |
           export MAKEFLAGS=-j4
-          export USE_PREBUILT_OTP="ubuntu-20.04"
+          export USE_PREBUILT_OTP="ubuntu-22.04"
           vfox install erlang@maint-27
           vfox use -g erlang@maint-27
           eval "$(vfox activate bash)"

.github/workflows/update_otp_versions.yaml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
 

README.md

@@ -28,7 +28,7 @@ vfox-erlang plugin would install Erlang/OTP through the [Erlang/OTP](https://www
 
 Here are examples of installing on Ubuntu 20.04 and MacOS 13.
 
-### install in Linux (Ubuntu 20.04)
+### install in Linux (Ubuntu 20.04/22.04)
 
 ```shell
 # install utilities