Surface deployed endpoints on the GitHub run summary

[lionello]

What

Makes the deployed app's endpoints front and center on the GitHub Actions run, instead of buried in the collapsed action log.

Two changes to the deploy workflow template:

1. environment.url — wired to a new endpoint output from the Defang action, so GitHub shows a clickable "View deployment" link on the run page, the Environments tab, and the repo sidebar.
2. summary: true — the action writes a defang services table (public endpoints as links, internal services as code) to the job Summary tab.

The old separate command: services step is removed — its output only landed in the collapsed log, and the action now owns this.

Dependency

Requires the summary input and endpoint output to land in DefangLabs/defang-github-action (companion PR) and the v2 tag to move. Until then this degrades gracefully: GitHub logs an "unknown input" warning and the environment URL stays blank — nothing breaks.

Notes

• Almost all the logic lives in the action (generic, reusable by every Defang user). The only sample-specific bits are the summary: flag and the environment.url wiring — environment is a job-level key a composite action can't set.
• summary is disabled on down teardowns.
• Worth confirming on the first real workflow_dispatch run: that environment.url correctly resolves steps.deploy.outputs.endpoint.

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