ci(gstreamer): download SDK exclusively from S3 mirror on stable

[DonLakeFlyer]

Problem

Stable builds pulled the GStreamer SDK from gstreamer.freedesktop.org, meaning upstream packages could change or disappear out from under a stable release.

Change

GStreamer SDK downloads (CMake configure for android/ios/macos/windows, plus the Windows/macOS install-dependencies scripts) now come exclusively from the QGroundControl S3 mirror (dependencies/gstreamer/..., populated by mirror-gstreamer.yml). No public fallback.

• Integrity is verified against the in-tree pinned SHA256 checksums in .github/build-config.json (all 6 platform packages for 1.28.4 are pinned). The upstream .sha256sum sidecar is not mirrored, so the pin is the sole integrity source; a missing pin is a hard configure error by default (GStreamer_REQUIRE_CHECKSUM=ON).
• All 6 mirrored 1.28.4 packages verified present on S3.
• Diff kept deliberately minimal for the stable branch: the now-unused sidecar-fetch helpers (gstreamer_fetch_checksum, _gstreamer_download_sidecar) are left in place to avoid churn.

Stable-branch-only change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (Stable_V5.1@ecb0691). Learn more about missing BASE report.

Additional details and impacted files

@@              Coverage Diff               @@
##             Stable_V5.1   #14870   +/-   ##
==============================================
  Coverage               ?   32.82%           
==============================================
  Files                  ?      784           
  Lines                  ?    67689           
  Branches               ?    31362           
==============================================
  Hits                   ?    22217           
  Misses                 ?    30534           
  Partials               ?    14938           

Flag	Coverage Δ
unittests	32.82% <ø> (?)

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[github-actions]

Build Results

Platform Status

Platform	Status	Details
Linux	Passed	View
Windows	Passed	View
MacOS	Passed	View
Android	Passed	View

All builds passed.

Pre-commit

Check	Status	Details
pre-commit	Failed (non-blocking)	View

Pre-commit hooks: 2 passed, 75 failed, 7 skipped.

Test Results

linux-coverage-integration: 37 passed, 0 skipped
linux-coverage-unit: 121 passed, 0 skipped
linux-sanitizers-integration: 20 passed, 0 skipped
linux-sanitizers-unit: 121 passed, 0 skipped
Total: 299 passed, 0 skipped

Code Coverage

Coverage: 69.6%

No baseline available for comparison

Artifact Sizes

Artifact	Size
QGroundControl	252.26 MB
QGroundControl-aarch64	176.30 MB
QGroundControl-installer-AMD64	137.82 MB
QGroundControl-installer-AMD64-ARM64	80.34 MB
QGroundControl-installer-ARM64	109.08 MB
QGroundControl-linux	84.31 MB
QGroundControl-mac	84.31 MB
QGroundControl-x86_64	188.52 MB
No baseline available for comparison

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_{Updated: 2026-08-15 18:52:46 UTC • Commit: 7ec3a2d • Triggered by: Android}