tests: fix PRs with only deleted files running all spread tests from all systems on each system

[maykathm]

When PRs' only changes are deleted files, those changes are not detected, causing the spread filter to fail and all spread tests from all systems to run on every system.

Changes

• Update changed-files action: it was far behind the current release
• Include deleted files in changed files (the purpose of this addition is so that if the only change is deleting a spread test, then no spread tests will be run)
• If the changes continue to remain empty, then do not call the spread filter and just run all tests on the current system

[github-actions]

Thu Jan 23 17:19:16 UTC 2025
The following results are from: https://github.com/canonical/snapd/actions/runs/12928717632

Failures:

Preparing:

• openstack:fedora-40-64:tests/main/interfaces-network-control-ip-netns
• openstack:opensuse-tumbleweed-64
• openstack:opensuse-tumbleweed-64
• openstack:opensuse-tumbleweed-64
• openstack:opensuse-tumbleweed-64
• openstack:opensuse-15.6-64
• openstack:opensuse-15.6-64
• openstack:opensuse-15.6-64
• openstack:opensuse-15.6-64
• openstack:opensuse-tumbleweed-64:tests/main/snapd-homedirs

Executing:

• google-distro-1:amazon-linux-2023-64:tests/main/auto-refresh-gating
• openstack:opensuse-tumbleweed-64:tests/main/snap-refresh-hold
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-pre-download:close_mid_restart
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-gating-from-snap
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-gating
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-pre-download:close
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh:parallel
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-pre-download:restart
• openstack:opensuse-15.6-64:tests/main/refresh:parallel_strict_remote
• openstack:opensuse-tumbleweed-64:tests/main/snapd-snap-auto-install
• openstack:opensuse-15.6-64:tests/main/refresh:strict_remote
• openstack:opensuse-15.6-64:tests/main/snapd-snap-auto-install
• google-arm:ubuntu-core-22-arm-64:tests/core/gadget-update-pc
• google:ubuntu-18.04-64:tests/unit/go:clang

Restoring:

• openstack:fedora-40-64:tests/main/snap-system-key
• openstack:fedora-40-64:tests/main/
• openstack:fedora-40-64
• openstack:fedora-40-64:tests/main/interfaces-network-control-ip-netns
• openstack:fedora-40-64:tests/main/
• openstack:fedora-40-64
• openstack:opensuse-tumbleweed-64
• openstack:opensuse-tumbleweed-64
• openstack:opensuse-tumbleweed-64
• openstack:opensuse-15.6-64
• openstack:opensuse-15.6-64
• openstack:opensuse-15.6-64
• openstack:opensuse-15.6-64
• openstack:opensuse-tumbleweed-64:tests/main/snapd-snap-auto-install
• openstack:opensuse-15.6-64:tests/main/snapd-snap-auto-install
• openstack:opensuse-15.6-64:tests/main/system-usernames-install-twice
• openstack:opensuse-15.6-64:tests/main/
• openstack:opensuse-15.6-64
• openstack:opensuse-tumbleweed-64:tests/main/snapd-homedirs
• openstack:opensuse-tumbleweed-64:tests/main/
• openstack:opensuse-tumbleweed-64
• google-arm:ubuntu-core-22-arm-64:tests/core/gadget-update-pc
• google-arm:ubuntu-core-22-arm-64:tests/core/
• google-arm:ubuntu-core-22-arm-64

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (master@dc7d81f). Learn more about missing BASE report.
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #14965   +/-   ##
=========================================
  Coverage          ?   78.27%           
=========================================
  Files             ?     1158           
  Lines             ?   153533           
  Branches          ?        0           
=========================================
  Hits              ?   120174           
  Misses            ?    25951           
  Partials          ?     7408           

Flag	Coverage Δ
unittests	78.27% <ø> (?)

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[bboozzoo]

Thanks!