feat: shared nightly release actions [ED-25507]

[Ntnelbaba]

Summary

Adds two composite actions backing the rolling nightly release for Elementor and Elementor Pro.

• publish-nightly-release — copies the built zip to a stable nightly filename, force-moves the nightly tag to the merge commit, and writes release notes. The tag has to be moved here because softprops/action-gh-release never repoints an existing tag. Consumed by both plugin repos; the only difference between them was the plugin slug, now an input.
• resolve-core-nightly — resolves the Core nightly release for a branch and optionally downloads the zip. Replaces per-repo logic in Pro that paged the releases API and parsed tag names.

The tag rule (main → nightly, any other branch → <version>-nightly) lives once in publish-nightly-release/nightly-tag.sh and is sourced by both actions, so producer and consumer cannot drift.

Jira

https://elementor.atlassian.net/browse/ED-25507

Made with Cursor

✨ PR Description

1. Problem & Context

Standardizes nightly release tagging across repositories to prevent naming drift between the producer (publish-nightly-release) and consumer (resolve-core-nightly). Addresses ED-25507.

2. What Changed (Where)

File	Change
nightly-tag.sh	New shared utility for tag name resolution logic.
publish-nightly-release.sh / action.yml	New action to force-move nightly tags and generate release notes.
resolve-core-nightly.sh / action.yml	New action to resolve tags via package.json and download assets.
README.md (both)	Documentation for inputs, outputs, and tagging rules.

3. How It Works

nightly-tag.sh acts as the single source of truth: it returns nightly for the main branch and <version>-nightly for others. The publish action uses this to force-push tags to a specific commit, while the resolve action uses it to fetch the correct nightly zip from the Core API.

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