Do not use deprecated set-output command

[giordano]

For reference, see https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/.

[vsoch]

Yep these changes look great! And I'm definitely aware - it was such a common task I made a tool for handling it: https://github.com/vsoch/action-updater.

If you like this prototype action, you might also be interested in:

• https://github.com/sciworks/spack-updater/ good if you maintain some set of spack packages and want an easier way to test builds regularly, and keep changes in sync with spack
• https://github.com/syspack/pakages is the refactored (somewhat cleaner) version of what is provided here!

[vsoch]

Looks like it can't find spec_jsons in the buildcache test https://github.com/vsoch/spack-package-action/actions/runs/3902914005/workflow#L34-L38 but I couldn't tell you why.

[giordano]

If I'm reading https://github.com/vsoch/spack-package-action/actions/runs/3902914005/jobs/6671759103#step:3:214 correctly, that's the output of

spack-package-action/package/scripts/build.sh

Lines 105 to 106 in 2f0a935

	# Did we make stuff?
	tree ${build_cache}

but there are no *.json files and so the loop

spack-package-action/package/scripts/build.sh

Line 115 in 2f0a935

for spec_json in $(find ${build_cache} -name *.json); do

is empty.