feat: bump KubeSolo to v1.1.5 + cross-arch CI workflow

Phase 4 of v0.3 — KubeSolo version bump and CI gating.

KubeSolo v1.1.0 → v1.1.5 brings:
- New flag --disable-ipv6 (v1.1.5)
- New flag --db-wal-repair (v1.1.5) — important for power-loss resilience
  on edge appliances; surfaced as kubesolo.db-wal-repair in cloud-init
- New flag --full (v1.1.4) — disables edge-optimised k8s overrides
- Pod egress connectivity fix after reboot (v1.1.4)
- Registry config persistence fix (v1.1.5)
- k8s 1.34.7, CoreDNS 1.14.3, Go 1.26.2

All three new flags wired into cloud-init: config.go fields, kubesolo.go
extra-flag emission, full-config.yaml example.

Supply-chain hygiene:
- Per-arch checksums: KUBESOLO_SHA256_AMD64 and KUBESOLO_SHA256_ARM64 in
  versions.env. Replaces the single shared KUBESOLO_SHA256 that couldn't
  meaningfully verify both binaries at once.
- Checksum now applied to the tarball (the immutable upstream artifact)
  rather than the post-extract binary.

CI:
- New .gitea/workflows/build-arm64.yaml routes the full kernel + rootfs +
  disk-image build to the Odroid arm64-linux runner. Triggers on push to
  main, tags, and manual workflow_dispatch. The boot smoke test is
  continue-on-error because KubeSolo's first-boot image import deadline
  fires under QEMU TCG on the Odroid.

VERSION bumped to 0.3.0-dev. CHANGELOG entry under [0.3.0-dev] captures all
Phase 1-4 work + the known limitations documented in arm64-status.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cloud-init/config.go

@@ -40,6 +40,14 @@ type KubeSoloConfig struct {
 	PortainerEdgeID        string   `yaml:"portainer-edge-id"`
 	PortainerEdgeKey       string   `yaml:"portainer-edge-key"`
 	PortainerEdgeAsync     bool     `yaml:"portainer-edge-async"`
+	// v1.1.4+: skip edge-optimised overrides, use upstream k8s defaults
+	// (useful for CI and powerful machines, disabled by default).
+	Full bool `yaml:"full"`
+	// v1.1.5+: disable IPv6 in the cluster.
+	DisableIPv6 bool `yaml:"disable-ipv6"`
+	// v1.1.5+: detect SQLite WAL corruption on startup and recover from
+	// unclean shutdowns (e.g. power loss). Recommended ON for edge devices.
+	DBWALRepair bool `yaml:"db-wal-repair"`
 }
 
 // NTPConfig defines NTP settings.