Update minimal ubuntu version used from 18.04 to 20.04

.github/workflows/flaky-tests.yml

@@ -10,8 +10,8 @@ jobs:
   flaky:
     runs-on: ubuntu-latest
     container:
-      # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
-      image: ubuntu:18.04
+      # Use ubuntu-20.04 to compile with glibc 2.28
+      image: ubuntu:20.04
     steps:
     - uses: actions/checkout@v3
     - name: Install needed dependencies

.github/workflows/publish-apt-brew-pkg.yml

@@ -20,8 +20,8 @@ jobs:
     runs-on: ubuntu-latest
     needs: check-version
     container:
-      # Use ubuntu-18.04 to compile with glibc 2.27
-      image: ubuntu:18.04
+      # Use ubuntu-20.04 to compile with glibc 2.28
+      image: ubuntu:20.04
     steps:
     - name: Install needed dependencies
       run: |

.github/workflows/publish-binaries.yml

@@ -39,8 +39,8 @@ jobs:
       ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
     needs: check-version
     container:
-      # Use ubuntu-18.04 to compile with glibc 2.27
-      image: ubuntu:18.04
+      # Use ubuntu-20.04 to compile with glibc 2.28
+      image: ubuntu:20.04
     steps:
     - uses: actions/checkout@v3
     - name: Install needed dependencies
@@ -129,8 +129,8 @@ jobs:
     env:
       ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
     container:
-      # Use ubuntu-18.04 to compile with glibc 2.27
-      image: ubuntu:18.04
+      # Use ubuntu-20.04 to compile with glibc 2.28
+      image: ubuntu:20.04
     strategy:
       matrix:
         include:

.github/workflows/test-suite.yml

@@ -19,13 +19,13 @@ env:
 
 jobs:
   test-linux:
-    name: Tests on ubuntu-18.04
+    name: Tests on ubuntu-20.04
     runs-on: ubuntu-latest
     env:
       ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
     container:
-      # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
-      image: ubuntu:18.04
+      # Use ubuntu-20.04 to compile with glibc 2.28
+      image: ubuntu:20.04
     steps:
       - uses: actions/checkout@v3
       - name: Install needed dependencies
@@ -76,8 +76,8 @@ jobs:
     env:
       ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
     container:
-      # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
-      image: ubuntu:18.04
+      # Use ubuntu-20.04 to compile with glibc 2.28
+      image: ubuntu:20.04
     if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
     steps:
       - uses: actions/checkout@v3
@@ -99,7 +99,7 @@ jobs:
       ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:18.04
+      image: ubuntu:20.04
     if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
     steps:
       - uses: actions/checkout@v3
@@ -125,8 +125,8 @@ jobs:
       ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
     runs-on: ubuntu-latest
     container:
-      # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
-      image: ubuntu:18.04
+      # Use ubuntu-20.04 to compile with glibc 2.28
+      image: ubuntu:20.04
     steps:
       - uses: actions/checkout@v3
       - name: Install needed dependencies

bors.toml

@@ -1,5 +1,5 @@
 status = [
-    'Tests on ubuntu-18.04',
+    'Tests on ubuntu-20.04',
     'Tests on macos-12',
     'Tests on windows-2022',
     'Run Clippy',