Add comment to bring more context

.github/workflows/flaky.yml

@@ -8,8 +8,8 @@ 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
-
     steps:
     - uses: actions/checkout@v3
     - name: Install needed dependencies

.github/workflows/publish-binaries.yml

@@ -37,6 +37,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: check-version
     container:
+      # Use ubuntu-18.04 to compile with glibc 2.27
       image: ubuntu:18.04
     steps:
     - uses: actions/checkout@v3

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

@@ -18,6 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: check-version
     container:
+      # Use ubuntu-18.04 to compile with glibc 2.27
       image: ubuntu:18.04
     steps:
     - name: Install needed dependencies

.github/workflows/rust.yml

@@ -19,6 +19,7 @@ jobs:
     name: Tests on ubuntu-18.04
     runs-on: ubuntu-latest
     container:
+      # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
       image: ubuntu:18.04
     steps:
     - uses: actions/checkout@v3
@@ -70,6 +71,7 @@ jobs:
     name: Run tests in debug
     runs-on: ubuntu-latest
     container:
+      # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
       image: ubuntu:18.04
     steps:
       - uses: actions/checkout@v3