Cron last day of the month

# /etc/systemd/system/my-job.timer
[Unit]
Description=Run my-job (last day of the month)

[Timer]
OnCalendar=*-*~01 23:00:00
Persistent=true

[Install]
WantedBy=timers.target

# /etc/systemd/system/my-job.service
[Unit]
Description=my-job

[Service]
Type=oneshot
ExecStart=/usr/local/bin/my-job.sh
# runs only if ExecStart succeeded
ExecStartPost=/usr/bin/curl -fsS -m 10 --retry 3 -o /dev/null https://puzaricloud.in/ping/<your-token>

apiVersion: batch/v1
kind: CronJob
metadata:
  name: my-job
spec:
  schedule: "0 23 28-31 * *"
  timeZone: "Etc/UTC"          # Kubernetes 1.27+; otherwise the controller's timezone
  concurrencyPolicy: Forbid       # don't start a new run while one is active
  startingDeadlineSeconds: 300    # still start if the controller was briefly down
  jobTemplate:
    spec:
      backoffLimit: 2
      template:
        spec:
          restartPolicy: OnFailure
          containers:
            - name: job
              image: your-image:tag
              command: ["/bin/sh", "-c", "if [ \"$(date -d tomorrow +%d)\" = 01 ]; then /app/run-job.sh; fi && curl -fsS -m 10 --retry 3 -o /dev/null https://puzaricloud.in/ping/<your-token>"]

on:
  schedule:
    - cron: "0 23 28-31 * *"   # always evaluated in UTC
  workflow_dispatch: {}          # lets you run it by hand too

jobs:
  run:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: "if [ \"$(date -d tomorrow +%d)\" = 01 ]; then ./run-job.sh; fi"
      - name: Tell Vigil the job ran
        if: success()
        run: curl -fsS -m 10 --retry 3 -o /dev/null https://puzaricloud.in/ping/${{ secrets.VIGIL_PING_TOKEN }}