Use external grep package in GitHub actions, new site config instructions, and pre-configured tier-1 sites

[climbfuji]

Summary

External grep in new site configs (documentation), CI, Containers, pre-configured sites (at least tier 1).

Tier 1 (mandatory):

• acorn (EMC): deferred to Add external grep to acorn site config #1431
• atlantis (@climbfuji)
• aws-pcluster (JCSDA)
• blueback (@climbfuji)
• derecho (EPIC)
• discover-scu16 (JCSDA)
• discover-scu17 (JCSDA)
• gaea-c5 (EPIC)
• gaea-c6 (EPIC)
• hera (EPIC)
• hercules (EPIC)
• jet (EPIC)
• narwhal (@climbfuji)
• nautilus (@climbfuji)
• navy-aws (@climbfuji)
• noaa-aws (EPIC)
• noaa-azure (EPIC)
• noaa-gcloud (EPIC)
• orion (EPIC)
• s4 (climbfuji)

Tier 2 (optional):

• blackpearl(@climbfuji)
• bounty (@climbfuji)
• casper (@climbfuji)
• emc-rhel
• frontera
• linux.default in documentation (secion "New Site Config")
• macos.default in documentation (secion "New Site Config")

Container recipes:

• GNU (@climbfuji)
• Clang (@climbfuji)
• Intel (@climbfuji)

CI:

• All Linux runners (@climbfuji)
• macOS runner (@climbfuji)

Testing

See above

Applications affected

None (external grep is a prerequisite for the upcoming GitHub CLI gh package).

Systems affected

All.

Dependencies

• waiting on Configure 'spack external find grep' spack#492

Issue(s) addressed

Working towards #1105

Checklist

• This PR addresses one issue/problem/enhancement, or has a very good reason for not doing so.
• These changes have been tested on the affected systems and applications.
• All dependency PRs/issues have been resolved and this PR can be merged.

[rickgrubin-tomorrow]

EPIC hosts

• derecho

$ which grep
/usr/bin/grep

$ grep --version
grep (GNU grep) 3.1

• gaea C5

$ which grep
/bin/grep
$ grep --version
grep (GNU grep) 3.1

• gaea C6

$ which grep
/bin/grep
$ grep --version
grep (GNU grep) 3.1

• hera

$ which grep
/usr/bin/grep

$ grep --version
grep (GNU grep) 3.1

• hercules

$ which grep
/usr/bin/grep

$ grep --version
grep (GNU grep) 3.6

• jet

$ which grep
/bin/grep

$ grep --version
grep (GNU grep) 3.1

• noaa-aws

$ which grep
/usr/bin/grep

$ grep --version
grep (GNU grep) 3.1

• noaa-azure

$ which grep
/usr/bin/grep

$ grep --version
grep (GNU grep) 3.1

• noaa-gcloud

$ which grep
/usr/bin/grep

$ grep --version
grep (GNU grep) 3.1

• orion

$ which grep
/usr/bin/grep

$ grep --version
grep (GNU grep) 3.6

[climbfuji]

@AlexanderRichert-NOAA Can you please provide details on the OS grep on Acorn so that we can merge this PR? Thanks.

[climbfuji]

This PR is blocking other PRs. Can someone please review? If we don't get the external grep info for acorn before merging, I will create an issue to remind us to add that missing site config update later. Thanks!

[rickgrubin-noaa]

LGTM