stop using Ubuntu 20.4 in GitHub Actions workflows, use Ubuntu 22.04 instead

[boegel]

Ubuntu 20.04 image for GitHub Actions is deprecated since 2025-02-01, see also actions/runner-images#11101

[Micket]

lgtm

[branfosj]

This failure on Ubuntu 24.04 can be avoided with --filter-deps=binutils

Log file from a local build

gcc -Wall -Winline -O3 -fPIC -g -D_FILE_OFFSET_BITS=64 -c huffman.c

If compilation produces errors, or a large number of warnings,
please read README.COMPILATION.PROBLEMS -- you might be able to
adjust the flags in this Makefile to improve matters.

Also in README.COMPILATION.PROBLEMS are some hints that may help
if your build produces an executable which is unable to correctly
handle so-called 'large files' -- files of size 2GB or more.

gcc -Wall -Winline -O3 -fPIC -g -D_FILE_OFFSET_BITS=64 -c crctable.c
gcc -Wall -Winline -O3 -fPIC -g -D_FILE_OFFSET_BITS=64 -c blocksort.c
gcc -Wall -Winline -O3 -fPIC -g -D_FILE_OFFSET_BITS=64 -c randtable.c
gcc -Wall -Winline -O3 -fPIC -g -D_FILE_OFFSET_BITS=64 -c compress.c
gcc -Wall -Winline -O3 -fPIC -g -D_FILE_OFFSET_BITS=64 -c decompress.c
gcc -Wall -Winline -O3 -fPIC -g -D_FILE_OFFSET_BITS=64 -c bzlib.c
gcc -Wall -Winline -O3 -fPIC -g -D_FILE_OFFSET_BITS=64 -c bzip2.c
gcc -Wall -Winline -O3 -fPIC -g -D_FILE_OFFSET_BITS=64 -c bzip2recover.c
bzip2.c: In function ‘applySavedFileAttrToOutputFile’:
bzip2.c:1073:11: warning: ignoring return value of ‘fchown’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
 1073 |    (void) fchown ( fd, fileMetaInfo.st_uid, fileMetaInfo.st_gid );
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
gcc -Wall -Winline -O3 -fPIC -g -D_FILE_OFFSET_BITS=64  -o bzip2recover bzip2recover.o
/home/simon/work/eb/installpath/software/binutils/2.37/bin/ld: /lib/x86_64-linux-gnu/libc.so.6: unknown type [0x13] section `.relr.dyn'
/home/simon/work/eb/installpath/software/binutils/2.37/bin/ld: skipping incompatible /lib/x86_64-linux-gnu/libc.so.6 when searching for /lib/x86_64-linux-gnu/libc.so.6
/home/simon/work/eb/installpath/software/binutils/2.37/bin/ld: cannot find /lib/x86_64-linux-gnu/libc.so.6
/home/simon/work/eb/installpath/software/binutils/2.37/bin/ld: /lib/x86_64-linux-gnu/libc.so.6: unknown type [0x13] section `.relr.dyn'
/home/simon/work/eb/installpath/software/binutils/2.37/bin/ld: skipping incompatible /lib/x86_64-linux-gnu/libc.so.6 when searching for /lib/x86_64-linux-gnu/libc.so.6
/home/simon/work/eb/installpath/software/binutils/2.37/bin/ld: /lib64/ld-linux-x86-64.so.2: unknown type [0x13] section `.relr.dyn'
/home/simon/work/eb/installpath/software/binutils/2.37/bin/ld: skipping incompatible /lib64/ld-linux-x86-64.so.2 when searching for /lib64/ld-linux-x86-64.so.2
/home/simon/work/eb/installpath/software/binutils/2.37/bin/ld: cannot find /lib64/ld-linux-x86-64.so.2
/home/simon/work/eb/installpath/software/binutils/2.37/bin/ld: /lib64/ld-linux-x86-64.so.2: unknown type [0x13] section `.relr.dyn'
/home/simon/work/eb/installpath/software/binutils/2.37/bin/ld: skipping incompatible /lib64/ld-linux-x86-64.so.2 when searching for /lib64/ld-linux-x86-64.so.2
collect2: error: ld returned 1 exit status
make: *** [Makefile:44: bzip2recover] Error 1
make: *** Waiting for unfinished jobs....

[branfosj]

$ gcc --version
gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
Copyright (C) 2023 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ ld --version
GNU ld (GNU Binutils for Ubuntu) 2.42
Copyright (C) 2024 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.

[boegel]

Hmm, tests in new workflow file seem to hang, and eventually the workflow times out after ~6h

Not sure what's going on there...

[boegel]

I've fleshed out the separate workflow to keep running the tests with Python 3.6 to a separate PR, to unblock this one:

• add custom GitHub Actions workflow to run tests with Python 3.6 in Ubuntu 20.04 container #4790

[lexming]

LGTM