testsuite: skip el capitan test by default

Problem: the debian riscv64 build environment is failing on the
el capitan scaling test.

We don't have detailed test output to diagnose the failure but we
can probably assume that this is a fairly under-powered builder.

Set the EXPENSIVE built-in test prereq so that this test only runs
if TEST_LONG is set in the environment or the --long test option is
given.

To avoid losing coverage in github CI, also allow the test to run
if GITHUB_CI is set in the environment, and then set it where the
workflow runs make check.

Fixes chaos#206

more

.github/workflows/main.yml

@@ -44,7 +44,7 @@ jobs:
  --with-tcp-wrappers
  - name: make
  run: make
- - name: make check
+ - name: GITHUB_CI=t make check
  run: make check
  - name: make distcheck
  run: DISTCHECK_CONFIGURE_FLAGS=--with-redfishpower make distcheck

t/t0039-llnl-el-capitan-cluster.t

@@ -4,6 +4,12 @@ test_description='Check LLNL El Capitan config'
 
 . `dirname $0`/sharness.sh
 
+# Setting the --long option or TEST_LONG=t fulfills the EXPENSIVE prereq
+if ! test_have_prereq EXPENSIVE && ! test -n "$GITHUB_CI"; then
+ skip_all='skipping large scale El Capitan test'
+ test_done
+fi
+
 ulimit -n 2048
 
 powermand=$SHARNESS_BUILD_DIRECTORY/src/powerman/powermand