[skill-activity] Clarify repository choice in "Explore a real workflow" (step 04)

[github-actions]

Updates the "Try it: Explore a real workflow" activity in workshop/04-github-actions-intro.md.

• Pain point: "any public repository" is ambiguous and doesn't work for GHES/enterprise-managed learners who can't browse github.com freely.
• Change: Points learners to their practice repo or the workshop repo, and tells enterprise learners to use any repo on their own instance with an Actions tab.
• Why: Removes a stumbling block early in the flow and serves enterprise learners.

The open curriculum issues target the assessment script under .github/skills/**, which is out of scope here. markdownlint could not run because npm was blocked.

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• registry.npmjs.org

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "registry.npmjs.org"

See Network Configuration for more information.

Generated by 🧩 Workshop Skill Activity Author · copilot · auto · 15.4 AIC · ⌖ 0.715 AIC · ⊞ 8.4K · ◷

• expires on Oct 16, 2026, 2:40 AM UTC