Account for different ISSUE_TEMPLATE situations

[chadwhitacre]

• issue template with no headers: Ignore empty templates during validation #29
• issue template from .github repo → Check global issue templates if none in local repo #31
• ISSUE_TEMPLATE.md not relevant at the moment, not sure it ever will be
• etc.? I think we're good.
• issue template exact match (e.g.)
• Replace gh api call with gh issue comment #25

[chadwhitacre]

When run in a test:

  2021-01-28T16:43:39.4331449Z pass
  2021-01-28T16:43:39.4351926Z 
  2021-01-28T16:43:39.4359178Z pass
  2021-01-28T16:43:39.4373320Z foo
  2021-01-28T16:43:39.4381543Z pass
  2021-01-28T16:43:39.4402564Z pass
  2021-01-28T16:43:39.4418908Z fail

When run directly:

pass

pass
foo
pass
pass
pass

[chadwhitacre]

Same shell.

/bin/bash
GNU bash, version 4.4.20(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
fail

Run echo "$SHELL"
/bin/bash
GNU bash, version 4.4.20(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
pass

[chadwhitacre]

https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#using-a-specific-shell

Default is sh -e {0}, shell: bash results in bash --noprofile --norc -eo pipefail {0}.

The pipefail explains the early termination in the shell: bash case when grep finds no match.