README.md: bump checkout action to latest version v4 (#20) #36

reviewdog [shellcheck] report

reported by reviewdog 🐶

Findings (9)

entrypoint.sh|10 col 16| Quote to prevent word splitting/globbing, or split robustly with mapfile or read -a.
entrypoint.sh|12 col 16| Quote to prevent word splitting/globbing, or split robustly with mapfile or read -a.
entrypoint.sh|12 col 19| Quote to prevent word splitting/globbing, or split robustly with mapfile or read -a.
entrypoint.sh|14 col 16| Quote to prevent word splitting/globbing, or split robustly with mapfile or read -a.
entrypoint.sh|49 col 33| Use "${array[@]}" (with quotes) to prevent whitespace problems.
entrypoint.sh|56 col 32| Double quote to prevent globbing and word splitting.
entrypoint.sh|74 col 33| Double quote to prevent globbing and word splitting.
entrypoint.sh|76 col 34| Double quote to prevent globbing and word splitting.
entrypoint.sh|87 col 34| Double quote to prevent globbing and word splitting.

Filtered Findings (0)