feat: add containers.txt to release assets for immutable image references

[Copilot]

Each AWF release publishes container images to GHCR, but consumers have no machine-readable way to know which exact image digests correspond to a given release. This adds a containers.txt file to every release with all five container images pinned by SHA digest, enabling immutable/reproducible consumption.

Changes

• Job outputs: Added outputs: digest: to each container build job (build-squid, build-agent, build-api-proxy, build-cli-proxy, build-agent-act) — exposes the digest emitted by docker/build-push-action
• Generate containers list: New step in release job (runs before checksum generation) that writes release/containers.txt using the digests passed down from each build job
• Release asset: release/containers.txt added to the softprops/action-gh-release files list, placed before checksums.txt so it is covered by the SHA-256 checksum

Output format

ghcr.io/github/gh-aw-firewall/squid@sha256:abc123...
ghcr.io/github/gh-aw-firewall/agent@sha256:def456...
ghcr.io/github/gh-aw-firewall/agent-act@sha256:789ghi...
ghcr.io/github/gh-aw-firewall/api-proxy@sha256:jkl012...
ghcr.io/github/gh-aw-firewall/cli-proxy@sha256:mno345...

Consumers (e.g. gh-aw) can parse this file to pre-download or verify the exact images shipped with a release without relying on mutable tags.

[Copilot]

Pull request overview

Adds a machine-readable containers.txt release asset listing the exact GHCR image digests for each AWF release, enabling immutable/reproducible image consumption.

Changes:

• Exposes docker/build-push-action digests as job outputs for all container build jobs.
• Generates release/containers.txt in the release job using those digests.
• Uploads release/containers.txt as a GitHub Release asset (and ensures it’s included in checksums.txt generation).

Show a summary per file

File	Description
.github/workflows/release.yml	Plumbs image digest outputs through build jobs and generates/uploads containers.txt as part of the release assets.

Copilot's findings

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• Files reviewed: 1/1 changed files
• Comments generated: 1

[github-actions]

Smoke test results (run 24289182699)

• ✅ GitHub MCP: fix: skip add_labels in build-test on workflow_dispatch / fix: remove duplicate paragraph and revert cron in firewall-issue-dispatcher
• ✅ Playwright: github.com title contains "GitHub"
• ✅ File write: /tmp/gh-aw/agent/smoke-test-claude-24289182699.txt created and verified

Overall: PASS

💥 [THE END] — Illustrated by Smoke Claude

[github-actions]

🔥 Smoke Test Results — PASS

Test	Result
GitHub MCP (list merged PRs → #1914)	✅
GitHub.com connectivity (HTTP 200)	✅
File write/read (smoke-test-copilot-24289182698.txt)	✅

PR: feat: add containers.txt to release assets for immutable image references
Author: @app/copilot-swe-agent · Assignees: @lpcox @Copilot

Overall: PASS ✅

📰 BREAKING: Report filed by Smoke Copilot

[github-actions]

Smoke test results (Codex)

• Merged PR titles: "fix: skip add_labels in build-test on workflow_dispatch" | "feat: fail fast when DOCKER_HOST points to an external daemon (workflow-scope DinD)" ✅
• safeinputs-gh PR query (2 PRs): ❌ (tool unavailable in this runtime)
• Playwright github.com title contains "GitHub": ✅
• Tavily search "GitHub Agentic Workflows Firewall": ❌ (Tavily MCP unavailable)
• File write/read /tmp/gh-aw/agent/smoke-test-codex-24289182710.txt: ✅
• Bash verification (cat): ✅
• Discussion query + oracle discussion comment: ❌ (discussion query/write target unavailable)
• Build (npm ci && npm run build): ✅
  Overall status: FAIL

🔮 The oracle has spoken through Smoke Codex

[github-actions]

Smoke Test: GitHub Actions Services Connectivity ✅

Check	Result
Redis PING (host.docker.internal:6379)	✅ PONG
pg_isready (host.docker.internal:5432)	✅ accepting connections
psql SELECT 1 (db: smoketest, user: postgres)	✅ returned 1

All checks passed. (redis-cli unavailable; used nc for Redis ping.)

🔌 Service connectivity validated by Smoke Services

[github-actions]

🏗️ Build Test Suite Results

Ecosystem	Project	Build/Install	Tests	Status
Bun	elysia	✅	1/1 passed	✅ PASS
Bun	hono	✅	1/1 passed	✅ PASS
C++	fmt	✅	N/A	✅ PASS
C++	json	✅	N/A	✅ PASS
Deno	oak	N/A	1/1 passed	✅ PASS
Deno	std	N/A	1/1 passed	✅ PASS
.NET	hello-world	✅	N/A	✅ PASS
.NET	json-parse	✅	N/A	✅ PASS
Go	color	✅	1/1 passed	✅ PASS
Go	env	✅	1/1 passed	✅ PASS
Go	uuid	✅	1/1 passed	✅ PASS
Java	gson	✅	1/1 passed	✅ PASS
Java	caffeine	✅	1/1 passed	✅ PASS
Node.js	clsx	✅	All passed	✅ PASS
Node.js	execa	✅	All passed	✅ PASS
Node.js	p-limit	✅	All passed	✅ PASS
Rust	fd	✅	1/1 passed	✅ PASS
Rust	zoxide	✅	1/1 passed	✅ PASS

Overall: 8/8 ecosystems passed — ✅ PASS

Generated by Build Test Suite for issue #1916 · ● 1.4M · ◷