A script that automatically commits changes to stuff in a directory

auto-commit.sh

#!/bin/bash

# Script to auto commit all changes in a specific repository
# Run this with a scheduler like launchd or systemd

REMOTE=origin
BRANCH=master
DIR="$1"

[[ -z "$DIR" ]] && DIR="."
[[ ! -d "$DIR" ]] && echo "[LOG] Invalid directory" && exit 2
cd "$DIR"
[[ $? -ne 0 ]] && echo "[LOG] Access to directory is restricted" && exit 3
[[ ! -d ".git" ]] && echo "[LOG] Not a git repository" && exit 4

MSG="Auto commit for [$(pwd)] at [$(date)]"
echo "[LOG] Running backup: $MSG"

# Note: We expect the repo to have been cloned... if starting fresh, make the first commit manually
git log --oneline $REMOTE/$BRANCH..$BRANCH >/dev/null
[[ $? -ne 0 ]] && echo "[LOG] Error comparing changelog, probably repo not setup correctly?" && exit 5
PENDING=$(git log --oneline $REMOTE/$BRANCH..$BRANCH | wc -l | xargs)
[[ "$PENDING" -ne 0 ]] && echo "[LOG] Found $PENDING pending commits"
[[ "$PENDING" -gt 3 ]] && echo "[LOG] Warning: auto-commit has multiple consecutive failures"

git add .
git commit -m "$MSG"
[[ $? -ne 0 ]] && echo "[LOG] No new changes detected" && [[ "$PENDING" -eq 0 ]] && exit 0

git fetch $REMOTE $BRANCH >/dev/null
[[ $? -ne 0 ]] && echo "[LOG] Error accessing remote server" && exit 6
git push $REMOTE $BRANCH
if [[ $? -eq 0 ]]
then
  echo "[LOG] Successfully pushed backup"
else
  echo "[LOG] Failed to push"
  echo "[LOG] All pending commits will be synced in the next successful push"
  exit 7
fi

org.codi.backup.work.plist

<!-- Data backup launchd agent for work directory -->
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN"
  "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>Label</key>
    <string>org.codi.backup.work</string>

    <key>WorkingDirectory</key>
    <string>/Users/ppanchal/Documents/work</string>

    <key>Program</key>
    <string>/Users/ppanchal/Documents/work/.auto-commit.sh</string>

    <key>ExitTimeOut</key>
    <integer>60</integer>

    <!-- Every weekday at 2 pm IST (0830 UTC) -->
    <key>StartCalendarInterval</key>
    <array>
      <dict>
        <key>Hour</key>
        <integer>8</integer>
        <key>Minute</key>
        <integer>30</integer>
        <key>Weekday</key>
        <integer>1</integer>
      </dict>
      <dict>
        <key>Hour</key>
        <integer>8</integer>
        <key>Minute</key>
        <integer>30</integer>
        <key>Weekday</key>
        <integer>2</integer>
      </dict>
      <dict>
        <key>Hour</key>
        <integer>8</integer>
        <key>Minute</key>
        <integer>30</integer>
        <key>Weekday</key>
        <integer>3</integer>
      </dict>
      <dict>
        <key>Hour</key>
        <integer>8</integer>
        <key>Minute</key>
        <integer>30</integer>
        <key>Weekday</key>
        <integer>4</integer>
      </dict>
      <dict>
        <key>Hour</key>
        <integer>8</integer>
        <key>Minute</key>
        <integer>30</integer>
        <key>Weekday</key>
        <integer>5</integer>
      </dict>
    </array>
  </dict>
</plist>

<!--
  Docs:
    https://medium.com/swlh/how-to-use-launchd-to-run-services-in-macos-b972ed1e352
    https://www.unix.com/man-page/osx/5/launchd.plist/
    https://en.wikipedia.org/wiki/Property_list#Format
  Debug:
    launchctl list | grep org.codi.backup.work
    launchctl debug gui/$UID/org.codi.backup.work --stdout --stderr
    launchctl kickstart gui/$UID/org.codi.backup.work
    launchctl kill gui/$UID/org.codi.backup.work
  Registration:
    launchctl bootstrap gui/$UID ~/Library/LaunchAgents/org.codi.backup.work.plist
    launchctl bootout gui/$UID/org.codi.backup.work
-->

This example uses launchd as its scheduler (native macos tool)
You can use systemctl as well which is available on linux