Upgrade GitHub runner image from Ubuntu 20.04 to 22.04 and modernize documentation (#1362)

* Initial plan

* Upgrade GitHub runner from Ubuntu 20.04 to 22.04

Co-authored-by: lalitb <1196320+lalitb@users.noreply.github.com>

* Update README.md and add Ubuntu 22.04 Docker support

- Add Ubuntu 22.04 LTS to Build Environments table with GCC 11.x.x
- Add Ubuntu 22.04.x LTS to Target Platforms table, marked as CI covered
- Create docker/ubuntu22.04/Dockerfile for build consistency
- Updated python to python3 in Ubuntu 22.04 Docker for compatibility

Co-authored-by: lalitb <1196320+lalitb@users.noreply.github.com>

* Add blank line at end of Dockerfile per review feedback

Co-authored-by: reyang <17327289+reyang@users.noreply.github.com>

* Remove Ubuntu 18.04 LTS references from README.md

Co-authored-by: lalitb <1196320+lalitb@users.noreply.github.com>

* Remove Ubuntu versions below 20.04 from README.md as requested

Co-authored-by: lalitb <1196320+lalitb@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: lalitb <1196320+lalitb@users.noreply.github.com>
Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>
Co-authored-by: reyang <17327289+reyang@users.noreply.github.com>

Author: 3 people

.github/workflows/build-ubuntu-2004.yml .github/workflows/build-ubuntu-2204.yml.github/workflows/build-ubuntu-2004.yml renamed to .github/workflows/build-ubuntu-2204.yml

@@ -1,4 +1,4 @@
-name: C/C++ CI on Ubuntu 18:04
+name: C/C++ CI on Ubuntu 22.04
 
 on:
   push:
@@ -28,11 +28,11 @@ jobs:
     strategy:
       matrix:
         config: [release, debug]
-        os: [ubuntu-20.04]
+        os: [ubuntu-22.04]
 
     steps:
     - name: Checkout
       uses: actions/checkout@v1
       continue-on-error: true
     - name: Test ${{ matrix.os }} ${{ matrix.config }}
-      run: ./build-tests.sh ${{ matrix.config }}
+      run: ./build-tests.sh ${{ matrix.config }}

README.md

@@ -69,9 +69,7 @@ Other resources to learn how to setup the build system:
   | Mac OS X 10.12.6              | Clang Xcode 9.0, 9.1             |
   | Mac OS X 10.13.3              | Clang Xcode 9.2, 9.3, 10.0, 10.1 |
   | Raspbian GNU/Linux 8 (jessie) | GCC 4.9.2 (armv7l)               |
-  | Ubuntu 14.04.x LTS            | GCC 5.x.x                        |
-  | Ubuntu 16.04 LTS              | GCC 5.x.x, GCC 5.x.x (armv7l)    |
-  | Ubuntu 18.04 LTS              | GCC 7.5.x                        |  
+  | Ubuntu 22.04 LTS              | GCC 11.x.x                       |
   | Windows 10                    | Android Studio/Gradle            |
   | Windows Server 2016           | Visual Studio 2017 (vc141)       |
   | Windows Server 2022           | Visual Studio 2022 (vc143)       |
@@ -86,10 +84,8 @@ Other resources to learn how to setup the build system:
   | Linux (x86, x64, arm, aarch64) | :white_check_mark: |                    |
   | Mac OS X 10.11+                | :white_check_mark: |                    |
   | Mac OS X (latest)              | :white_check_mark: | :white_check_mark: |
-  | Ubuntu 14.04.x LTS             | :white_check_mark: |                    |
-  | Ubuntu 16.04.x LTS             | :white_check_mark: |                    |
-  | Ubuntu 18.04.x LTS             | :white_check_mark: |                    |
   | Ubuntu 20.04.x LTS             | :white_check_mark: | :white_check_mark: |
+  | Ubuntu 22.04.x LTS             | :white_check_mark: | :white_check_mark: |
   | Ubuntu (latest)                | :white_check_mark: | :white_check_mark: |
   | Windows 7.1                    | :white_check_mark: |                    |
   | Windows 8.1                    | :white_check_mark: |                    |

docker/ubuntu22.04/Dockerfile

@@ -0,0 +1,22 @@
+FROM ubuntu:22.04
+
+ENV DEBIAN_FRONTEND noninteractive
+
+# Package installation
+RUN apt-get update
+
+## Common packages for linux build environment
+RUN apt install -y clang python3 pkg-config git curl nghttp2 bzip2 unzip make wget cmake sudo
+
+RUN adduser --disabled-password --gecos '' docker
+RUN adduser docker sudo
+RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+## RUN useradd -m docker && echo "docker:docker" | chpasswd && adduser docker sudo
+## USER docker
+
+# this is where I was running into problems with the other approaches
+RUN sudo apt-get update
+
+CMD /bin/bash
+
+# ENTRYPOINT bash