Update cross-compilation builder to Ubuntu 22

Update instructions and CI for cross-compilation on Ubuntu 22.
Note that for the dockerfile, we use egrep -L which has changed and does
not exit with code 0 on no match. Instead, use -vqz to invert return
code (0 if nothing found, otherwise 1).

doc/TESTBenches.md

@@ -89,8 +89,8 @@ information on how the images are built.
 - [RAN-ARM-Cross-Compile-Builder](https://jenkins-oai.eurecom.fr/job/RAN-ARM-Cross-Compile-Builder/)
   ~BUILD-ONLY ~4G-LTE ~5G-NR
   - orion: Cross-compilation from Intel to ARM
-  - base image from `Dockerfile.base.ubuntu20.cross-arm64`
-  - build image from `Dockerfile.build.ubuntu20.cross-arm64` (no target images)
+  - base image from `Dockerfile.base.ubuntu22.cross-arm64`
+  - build image from `Dockerfile.build.ubuntu22.cross-arm64` (no target images)
 - [RAN-cppcheck](https://jenkins-oai.eurecom.fr/job/RAN-cppcheck/)
   ~BUILD-ONLY ~4G-LTE ~5G-NR
   - bellatrix

doc/cross-compile.md

@@ -5,7 +5,7 @@
 
 ## Environment
 
-- OS: ubuntu 20.04
+- OS: ubuntu 22.04
 
 ### Set up the environment
 
@@ -15,21 +15,21 @@ Set up for install the package for aarch64.
 sudo dpkg --add-architecture arm64
 
 echo -e \
-        "deb [arch=arm64] http://ports.ubuntu.com/ focal main restricted\n"\
-        "deb [arch=arm64] http://ports.ubuntu.com/ focal-updates main restricted\n"\
-        "deb [arch=arm64] http://ports.ubuntu.com/ focal universe\n"\
-        "deb [arch=arm64] http://ports.ubuntu.com/ focal-updates universe\n"\
-        "deb [arch=arm64] http://ports.ubuntu.com/ focal multiverse\n"\
-        "deb [arch=arm64] http://ports.ubuntu.com/ focal-updates multiverse\n"\
-        "deb [arch=arm64] http://ports.ubuntu.com/ focal-backports main restricted universe multiverse"\
+        "deb [arch=arm64] http://ports.ubuntu.com/ jammy main restricted\n"\
+        "deb [arch=arm64] http://ports.ubuntu.com/ jammy-updates main restricted\n"\
+        "deb [arch=arm64] http://ports.ubuntu.com/ jammy universe\n"\
+        "deb [arch=arm64] http://ports.ubuntu.com/ jammy-updates universe\n"\
+        "deb [arch=arm64] http://ports.ubuntu.com/ jammy multiverse\n"\
+        "deb [arch=arm64] http://ports.ubuntu.com/ jammy-updates multiverse\n"\
+        "deb [arch=arm64] http://ports.ubuntu.com/ jammy-backports main restricted universe multiverse"\
     | sudo tee /etc/apt/sources.list.d/arm-cross-compile-sources.list
 
 sudo cp /etc/apt/sources.list "/etc/apt/sources.list.`date`.backup"
 sudo sed -i -E "s/(deb)\ (http:.+)/\1\ [arch=amd64]\ \2/" /etc/apt/sources.list
 
 sudo apt update
-sudo apt install -y gcc-9-aarch64-linux-gnu \
-                    g++-9-aarch64-linux-gnu
+sudo apt install -y gcc-11-aarch64-linux-gnu \
+                    g++-11-aarch64-linux-gnu
 
 sudo apt-get install -y \
     libatlas-base-dev:arm64 \