From c869f8a9fa216869bf731c5daefc41b09012d34a Mon Sep 17 00:00:00 2001
From: Andrey Semashev <andrey.semashev@gmail.com>
Date: Sun, 14 Aug 2022 14:20:34 +0300
Subject: [PATCH] Replaced ubuntu-18.04 GHA CI images with containers.

Also use ubuntu-latest image for jobs that are running in a container.
---
 .github/workflows/ci.yml | 53 ++++++++++++++++++++++++----------------
 1 file changed, 32 insertions(+), 21 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9006a0e..5c55825 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,4 @@
-# Copyright 2021 Andrey Semashev
+# Copyright 2021-2022 Andrey Semashev
 #
 # Distributed under the Boost Software License, Version 1.0.
 # (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
@@ -35,7 +35,7 @@ jobs:
           # Linux, gcc
           - toolset: gcc-4.4
             cxxstd: "98,0x"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             container: ubuntu:16.04
             install:
               - g++-4.4
@@ -43,7 +43,7 @@ jobs:
               - "ppa:ubuntu-toolchain-r/test"
           - toolset: gcc-4.6
             cxxstd: "03,0x"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             container: ubuntu:16.04
             install:
               - g++-4.6
@@ -51,45 +51,50 @@ jobs:
               - "ppa:ubuntu-toolchain-r/test"
           - toolset: gcc-4.7
             cxxstd: "03,11"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             container: ubuntu:16.04
             install:
               - g++-4.7
           - toolset: gcc-4.8
             cxxstd: "03,11"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - g++-4.8
           - toolset: gcc-4.9
             cxxstd: "03,11"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             container: ubuntu:16.04
             install:
               - g++-4.9
           - toolset: gcc-5
             cxxstd: "03,11,14,1z"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             container: ubuntu:16.04
             install:
               - g++-5
           - toolset: gcc-6
             cxxstd: "03,11,14,1z"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - g++-6
           - toolset: gcc-7
             cxxstd: "03,11,14,17"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - g++-7
           - toolset: gcc-8
             cxxstd: "03,11,14,17,2a"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - g++-8
           - toolset: gcc-9
             cxxstd: "03,11,14,17,2a"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - g++-9
           - toolset: gcc-10
@@ -119,66 +124,72 @@ jobs:
           - toolset: clang
             compiler: clang++-3.5
             cxxstd: "03,11"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             container: ubuntu:16.04
             install:
               - clang-3.5
           - toolset: clang
             compiler: clang++-3.6
             cxxstd: "03,11,14"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             container: ubuntu:16.04
             install:
               - clang-3.6
           - toolset: clang
             compiler: clang++-3.7
             cxxstd: "03,11,14"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             container: ubuntu:16.04
             install:
               - clang-3.7
           - toolset: clang
             compiler: clang++-3.8
             cxxstd: "03,11,14"
-            os: ubuntu-20.04
+            os: ubuntu-latest
             container: ubuntu:16.04
             install:
               - clang-3.8
           - toolset: clang
             compiler: clang++-3.9
             cxxstd: "03,11,14"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - clang-3.9
           - toolset: clang
             compiler: clang++-4.0
             cxxstd: "03,11,14"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - clang-4.0
           - toolset: clang
             compiler: clang++-5.0
             cxxstd: "03,11,14,1z"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - clang-5.0
           - toolset: clang
             compiler: clang++-6.0
             cxxstd: "03,11,14,17"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - clang-6.0
           - toolset: clang
             compiler: clang++-7
             cxxstd: "03,11,14,17"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - clang-7
           # Note: clang-8 does not fully support C++20, so it is not compatible with libstdc++-8 in this mode
           - toolset: clang
             compiler: clang++-8
             cxxstd: "03,11,14,17,2a"
-            os: ubuntu-18.04
+            os: ubuntu-latest
+            container: ubuntu:18.04
             install:
               - clang-8
               - g++-7