ci: provision a loopback LIO iSCSI target and run test-tool/iscsi-test-cu against it

[ddiss]

The ubuntu-latest github runner already carries the LIO kernel modules, so setup a basic loopback iSCSI target via configfs and then run test-tool/iscsi-test-cu against it.
I currently have it running all tests, but it might make sense to only run a few sanity checks, or the example binaries. It'll likely burn through CI credits pretty quickly if used as-is.
Edit: it's now only running Read10 and Write10 tests against the loopback target, which pass in around 3 minutes.

The following changes since commit 9ba97ca99e4670038212c2ba88cee68e4c0a7a7a:

  Merge pull request #470 from ddiss/chap_b64_fix_build_without_gnutls (2026-05-22 18:45:13 +1000)

are available in the Git repository at:

  https://github.com/ddiss/libiscsi.git lio-loopback-target

for you to fetch changes up to fc67ea0db26be6b52a252eb3bdf0384fcfa2caf4:

  ci: run iscsi-test-cu against the provisioned LIO target (2026-06-03 13:39:21 +1000)

----------------------------------------------------------------
David Disseldorp (4):
      ci: run on any branch push instead of only master
      ci/install: invoke apt-get install once
      ci: setup an LIO iSCSI target on loopback
      ci: run iscsi-test-cu against the provisioned LIO target

 .github/workflows/build.yml |  11 +++-
 ci/install.sh               |   4 +-
 ci/lio_setup.sh             | 121 ++++++++++++++++++++++++++++++++++++++++++++
 ci/run_test_tool.sh         |  12 +++++
 4 files changed, 143 insertions(+), 5 deletions(-)
 create mode 100755 ci/lio_setup.sh
 create mode 100755 ci/run_test_tool.sh

[ddiss]

Running all test-tool tests against LIO resulted in a (6-hour) timeout of the CI job. I'll rework this to only run a small subset of sanity tests for now.

[ddiss]

Running all test-tool tests against LIO resulted in a (6-hour) timeout of the CI job. I'll rework this to only run a small subset of sanity tests for now.

I've changed it to only run the Read10 and Write10 tests, which pass against the loopback LIO target in around 3 minutes.

[sahlberg]

Merged, thanks!