ci: migrate primary CI jobs to ARM runners

[thepastaclaw]

Summary

Migrate the primary CI path from x86 to ARM runners, reducing costs and providing native aarch64 build+test coverage.

Changes

Moved to ARM runners (runner-arm64)

• depends-linux64 (shared depends for linux64, fuzz, sqlite, ubsan)
• src-linux64 + test-linux64 (primary native build+test)
• src-linux64_fuzz (fuzz build)
• src-linux64_sqlite + test-linux64_sqlite (SQLite build+test)
• src-linux64_ubsan + test-linux64_ubsan (UBSan build+test)
• multiprocess + tsan were already on ARM — no change

Removed

• depends-aarch64-linux + src-aarch64-linux — the cross-compile job for aarch64-linux-gnu from x86 runners. We don't ship arm-linux-gnueabihf binaries, and native aarch64 coverage is now provided by the migrated jobs.
• ci/test/00_setup_env_aarch64.sh — the cross-compile setup script

Remaining on x86 (runner-amd64)

• nowallet (build + test) — sole native x86_64 coverage
• mac, win64 — cross-compile targets
• lint — architecture-independent

HOST detection centralization

Moved architecture-based HOST detection (aarch64-linux-gnu / x86_64-pc-linux-gnu) from individual setup scripts into ci/test/00_setup_env.sh. This:

• Uses explicit triplets matching depends (e.g. aarch64-linux-gnu instead of config.guess's aarch64-unknown-linux-gnu)
• Eliminates duplicated case blocks in 00_setup_env_native_qt5.sh, 00_setup_env_native_multiprocess.sh, 00_setup_env_native_tsan.sh
• Automatically provides correct HOST for all native targets (fuzz, sqlite, ubsan) without per-script changes
• Fixes PREVIOUS_RELEASES_DIR path computation which depended on HOST being set before the target script ran

Previous releases download fix

Added exact-match patterns for aarch64-linux-gnu and x86_64-linux-gnu in test/get_previous_releases.py, since the existing fnmatch glob aarch64-*-linux* requires a vendor field (e.g. aarch64-unknown-linux-gnu) and won't match the vendorless triplet.

Validation

• Verified all moved jobs reference runner-arm64 in build.yml
• Verified HOST detection in 00_setup_env.sh covers aarch64/x86_64 with dpkg fallback
• Verified fuzz, sqlite, and ubsan setup scripts inherit HOST correctly (none set it explicitly)
• Verified cross-compile scripts (mac, win64) still override HOST as needed
• Verified previous release binaries exist for aarch64-linux-gnu in SHA256_SUMS
• No references to deleted depends-aarch64-linux or src-aarch64-linux remain in build.yml

[thepastaclaw]

@coderabbitai review

[coderabbitai]

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[github-actions]

✅ No Merge Conflicts Detected

This PR currently has no conflicts with other open PRs.

[coderabbitai]

Walkthrough

The changes restructure CI/CD workflows and environment setup scripts, primarily removing aarch64 Linux build support and realigning the build infrastructure. The GitHub Actions build workflow is updated to remove aarch64-specific jobs and rename linux64 builds, with runner targets changing from amd64 to arm64 across multiple jobs. The CI matrix script removes aarch64-linux initialization, and the corresponding environment setup script is deleted entirely. The native Qt5 setup script is enhanced with architecture detection logic based on system properties (uname and dpkg output) and new environment variable exports for test execution and download configuration.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the primary change: migrating CI jobs from x86 to ARM runners, which aligns with the core objective of the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description is directly related to the changeset, providing clear context about migrating CI jobs from x86 to ARM runners and the specific changes made.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

📝 Coding Plan

• Generate coding plan for human review comments

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[PastaPastaPasta]

your branch ci fails here: https://github.com/thepastaclaw/dash/actions/runs/23168985036/job/67317597479

please continue tracking this until push ci on your repo is successful

[thepastaclaw]

The CI failure on the old commit (4b72d41) has been fixed. The latest commit (cba08c0) passes all CI — both on the fork and on upstream:

• Fork CI (push): Run 23210233386 — ✅ success (skipped redundant jobs since upstream CI covers them)
• Upstream CI (PR): Run 23210234315 — ✅ all jobs pass (depends, builds, tests across all targets)

The fixes in the force-push:

1. HOST detection centralized in 00_setup_env.sh — all native targets (fuzz, sqlite, ubsan) now inherit correct HOST automatically instead of needing per-script detection
2. Duplicate HOST detection removed from 00_setup_env_native_multiprocess.sh and 00_setup_env_native_tsan.sh
3. Previous releases fix — added exact-match patterns for aarch64-linux-gnu and x86_64-linux-gnu in get_previous_releases.py (vendorless triplets didn't match the existing fnmatch globs)