Modify ds-identify for Alpine support and add OpenRC init.d script

[dermotbradley]

feat(Alpine): Modify ds-identify for Alpine support and add OpenRC init.d script

Add OpenRC init.d script for ds-identify.

Add support to ds-identify for "virt-what" as an alternative to
"systemd-detect-virt" for non-systemd Linux distros.

Change ds-identify to use short option for "modprobe" for Busybox
compatibility.

Change ds-identify to use short options for "grep" as POSIX does not
define long options, they are a GNU-ism.

Additional Context

Test Steps

Checklist

• My code follows the process laid out in the documentation
• I have updated or added any unit tests accordingly
• I have updated or added any documentation accordingly

Merge type

• Squash merge using "Proposed Commit Message"
• Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number (#<PR_NUM>)

[igalic]

this looks pretty good at first blush

[dermotbradley]

The use of "virt-what" is a bit of a stop-gap, I'm considering writing an alternative (also in Shell) that uses /sys/class/dmi rather than "dmidecode" and that handles containers also (which virt-what doesn't).

[holmanb]

This looks good to me, thanks @dermotbradley!