Bash + `yq` Alternative: yq eval 'explode(.)'

https://stackoverflow.com/questions/67368724/share-same-steps-for-different-github-actions-jobs/67391185#67391185

TL;DR
------
I solved my problem with shell tool `yq`
```
yq eval 'explode(.)' file.yml
```

Long answer
--------------------------------

GitHub Workflow description in YAML does not support anchors.
There are several workarounds => anyway they come to building-editing workflow yaml from source.
So I suggest yet another one `make-workflows.sh` based on YAML tool `yq`.

### USAGE
0. Move your workflows to `.github/*.src.yml`
1. Put `make-workflows.sh` to directory `.github/`
2. (optional) Copy or link `pre-commit.sh` to `.git/hooks/pre-commit`
Like `ln -s ../../.github/pre-commit.sh .git/hooks/pre-commit`

----------------------------------------------

File `make-workflows.sh`
```
#!/usr/bin/env bash
set -euo pipefail

## The script expands '*.src.yml' from $1(default: script's directory)
## to $2 (default:subdirectory 'workflows') with corresponding name '*.yml'
## Main goal is to dereference YAML anchors.
## Deals only with Git cached/indexed files
## Set -x to debug

script_dir=$(dirname $(realpath "$0"))
dir_from=${1:-${script_dir}}
dir_to=${2:-workflows}
cd $dir_from

edited=
for f in $(git status -s -- \*.src.yml | sed 's,^.. ,,') ;do
readonly out=$(echo $f | sed s,.src.yml\$,.yml,)
readonly wout=$dir_to/$out
readonly tempout=$(mktemp)
trap "rm -f $tempout" EXIT
echo >>$tempout "## DO NOT EDIT"
echo >>$tempout "## Generated from $f with $(basename $0)"
echo >>$tempout ""
yq eval 'explode(.)' $f >>$tempout
if ! diff -q $wout $tempout &>/dev/null ;then
mv $tempout $wout
edited+="'$out' "
fi
done

if [[ -n "$edited" ]]
then echo >&2 "make-workflows: these files were edited: $edited"
else echo >&2 "make-workflows: everything is up to date"
fi
```

--------------------------

File pre-commit.sh
```
#!/usr/bin/env bash
set -euo pipefail

gitroot=$(git rev-parse --show-toplevel)

cd $gitroot
./.github/make-workflows.sh
git add .github/workflows
```

### Links
1. https://stackoverflow.com/questions/67368724/share-same-steps-for-different-github-actions-jobs
2. https://github.community/t/support-for-yaml-anchors/16128/60
3. https://github.com/mithro/actions-includes
4. https://github.com/allejo/gha-workflows