feat: support to restore mtime of all files (#40)

Restore the modification time (mtime) of all files in work tree, based
on the date of the most recent commit that modified the file.

entrypoint.sh

@@ -49,6 +49,10 @@ ${SCRIPT_DIR}/script/init_environment.sh
 
 cd ${JEKYLL_SRC}
 
+# Restore modification time (mtime) of git files
+echo "Restore modification time of all git files"
+${SCRIPT_DIR}/script/restore_mtime.sh
+
 # Check and execute pre_build_commands commands
 if [[ ${PRE_BUILD_COMMANDS} ]]; then
   echo "Executing pre-build commands"

script/restore_mtime.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+# Restore the modification time (mtime) of all files in work tree, based on the
+# date of the most recent commit that modified the file.
+for f in $(git ls-files); do
+  mtime=$(git log -1 --format='%at' -- "$f")
+  [[ "$mtime" == "" ]] && continue
+  mtime=$(date -d @"$mtime" "+%Y-%m-%dT%H:%M:%S")
+  touch -d "$mtime" "$f"
+done