Add support for "every n days" long-form schedule syntax

[Copilot]

The schedule parser accepted short-form every 2d but rejected long-form every 2 days, inconsistent with every 2 hours and every 10 minutes.

Changes

• Extended parseInterval() to accept "days" as valid unit alongside "minutes" and "hours"
• Added cron generation logic: every 1 day → 0 0 * * *, every n days → 0 0 */n * *
• Updated validation to include days in minimum duration check (5 minutes)
• Converted test case from error expectation to success case with 6 additional test variations
• Updated fuzz test corpus to treat days as valid input

Example

---
on: every 2 days
---

Compiles to:

on:
  schedule:
  - cron: "0 0 */2 * *"
    # Friendly format: every 2 days

Both every 2d and every 2 days now produce identical output.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/user
  • Triggering command: /usr/bin/gh gh api user --jq .login it/ref/tags/v5 --version /usr/bin/infocmp (http block)
  • Triggering command: /usr/bin/gh gh api user --jq .login it/ref/tags/v5 %(refname) /usr/bin/git --merged fbaa3ad27fdd4c63rev-parse modules/@npmcli/--show-toplevel git -C tags/v6 rev-parse /opt/hostedtoolcache/go/1.25.0/x64/pkg/tool/linux_amd64/vet 3-23b8fd6302d7/hinfocmp (http block)
  • Triggering command: /usr/bin/gh gh api user --jq .login ithub/workflows --json /usr/bin/git --jq .owner.login + "-1 64/pkg/tool/linuxterm-color git conf�� 3014-16824/test-3205709398/.github/workflows (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Add syntax in short on: schedule to express "every n days" where n > 1

on: every 2 days

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