Add grub and refind back

"rescue/installation actions for {grub,refind} should be run from
within a chroot" is a false statement. See --boot-directory of
grub-install and --root of refind-install. (In the case of grub,
there are people that do not use the ugly grub-mkconfig at all.)
7 jobs for grub_refind in 6 minutes and 46 seconds (queued for 5 seconds)
latest
Status Name Job ID Coverage
  Check
passed check #34928

00:00:27

 
  Build
failed build_long: [baseline iso] #34931
fast-single-thread

00:05:59

failed build_long: [baseline netboot] #34932
fast-single-thread

00:06:15

failed build_long: [releng iso] #34933
fast-single-thread

00:06:07

failed build_long: [releng netboot] #34934
fast-single-thread

00:05:57

failed build_short: [baseline bootstrap] #34929

00:05:49

failed build_short: [releng bootstrap] #34930

00:06:19

 
Name Stage Failure
failed
build_short: [releng bootstrap] Build
Running after_script
Running after script...
$ cp -v -- output/metrics.txt .
cp: cannot stat 'output/metrics.txt': No such file or directory
Uploading artifacts for failed job
Uploading artifacts...
WARNING: metrics.txt: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
build_long: [baseline netboot] Build
Running after_script
Running after script...
$ cp -v -- output/metrics.txt .
cp: cannot stat 'output/metrics.txt': No such file or directory
Uploading artifacts for failed job
Uploading artifacts...
WARNING: metrics.txt: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
build_long: [releng iso] Build
Running after_script
Running after script...
$ cp -v -- output/metrics.txt .
cp: cannot stat 'output/metrics.txt': No such file or directory
Uploading artifacts for failed job
Uploading artifacts...
WARNING: metrics.txt: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
build_long: [baseline iso] Build
Running after_script
Running after script...
$ cp -v -- output/metrics.txt .
cp: cannot stat 'output/metrics.txt': No such file or directory
Uploading artifacts for failed job
Uploading artifacts...
WARNING: metrics.txt: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
build_long: [releng netboot] Build
Running after_script
Running after script...
$ cp -v -- output/metrics.txt .
cp: cannot stat 'output/metrics.txt': No such file or directory
Uploading artifacts for failed job
Uploading artifacts...
WARNING: metrics.txt: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
build_short: [baseline bootstrap] Build
Running after_script
Running after script...
$ cp -v -- output/metrics.txt .
cp: cannot stat 'output/metrics.txt': No such file or directory
Uploading artifacts for failed job
Uploading artifacts...
WARNING: metrics.txt: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1