feat: update github workflows

[giovtorres]

• Added build-sdist CI job that builds and uploads the sdist artifact
• Added build_rpm.sh script and build-rpm CI job that builds, installs, and exercises the RPM spec file
• Added publish CI job that downloads the pre-built sdist artifact and publishes it to PyPI via Trusted Publishing
  (OIDC) on release.
• Updated pyslurm.spec to use modern %pyproject_* macros, drop the hardcoded Python version, and fix the license
  identifier from GPLv2+ to GPL-2.0-only.
• Updated docker-compose.yml to read the container image tag from SLURM_DOCKER_IMAGE so the workflow and compose file stay in sync.
• Updated README.md to document PyPI installation as the primary method and add a version compatibility table.

[giovtorres]

@tazend What are your thoughts on this change?

[tazend]

@giovtorres Looks good, and I think its nice to finally have up2date releases on PyPi again :) Thank you 👍

[tazend]

I know when using scripts/build.sh setuptools was always complaining about those. Adding pyslurm.slurm here should still include it in the sdist though right? (since its explicitly mentioned in MANIFEST.in). It just doesn't add those sources to the final installation dir I guess? (which is fine)

[giovtorres]

Yeah, both of these directories don’t have an __init__.py and only have Cython source files. The sdist does include these files since they are part of the source files needed to build the extension. The exclude here is so that these dirs don’t show up as importable Python packages, but they don’t have an __init__.py anyway. So, this shouldn’t change behavior, just make it explicit, if i’m not mistaken.

→ tar tzvf dist/pyslurm-25.11.0.tar.gz | grep pxi
-rw-r--r--  0 root   root       19 Feb 27  2022 pyslurm-25.11.0/pyslurm/bluegene.pxi
-rw-r--r--  0 root   root    16959 Mar 15 16:55 pyslurm-25.11.0/pyslurm/pydefines/slurm_defines.pxi
-rw-r--r--  0 root   root    22903 Mar 15 16:55 pyslurm-25.11.0/pyslurm/pydefines/slurm_enums.pxi
-rw-r--r--  0 root   root      116 Nov 14  2021 pyslurm-25.11.0/pyslurm/pydefines/slurm_errno_defines.pxi
-rw-r--r--  0 root   root    10772 Mar 15 16:55 pyslurm-25.11.0/pyslurm/pydefines/slurm_errno_enums.pxi
-rw-r--r--  0 root   root     2729 Mar 15 16:55 pyslurm-25.11.0/pyslurm/pydefines/slurmdb_defines.pxi
-rw-r--r--  0 root   root     4411 Mar 15 16:55 pyslurm-25.11.0/pyslurm/pydefines/slurmdb_enums.pxi
-rw-r--r--  0 root   root    10507 Mar 15 16:55 pyslurm-25.11.0/pyslurm/slurm/extra.pxi
-rw-r--r--  0 root   root     3351 Mar 15 16:55 pyslurm-25.11.0/pyslurm/slurm/helpers.pxi
-rw-r--r--  0 root   root    91453 Mar 15 16:55 pyslurm-25.11.0/pyslurm/slurm/slurm.h.pxi
-rw-r--r--  0 root   root    15320 Mar 15 16:55 pyslurm-25.11.0/pyslurm/slurm/slurm_errno.h.pxi
-rw-r--r--  0 root   root      842 Mar 15 16:55 pyslurm-25.11.0/pyslurm/slurm/slurm_version.h.pxi
-rw-r--r--  0 root   root    38974 Mar 15 16:55 pyslurm-25.11.0/pyslurm/slurm/slurmdb.h.pxi