Add gzip-aware crash upload and OTA staging build/deploy tooling.

This restores the interrupted stash work on a dedicated feature branch, including backend decoding support, Dockerized build scripts, and staging channel artifacts for end-to-end OTA validation.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/docker-build-ota.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+# Host wrapper: build androidcast-ci image and run build + OTA staging publish.
+#
+# Usage:
+#   export OTA_BASE_URL=https://apps.f0xx.org
+#   ./scripts/docker-build-ota.sh
+#
+# Artifacts: ./out/android_cast-latest.apk  ./out/ota/v0/ota/...
+#
+# Deploy to BE (example — adjust host/path):
+#   rsync -av ./out/ota/v0/ user@be:/var/www/localhost/htdocs/v0/
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+IMAGE="${ANDROIDCAST_CI_IMAGE:-androidcast-ci:latest}"
+
+docker build -t "$IMAGE" -f "${ROOT}/Dockerfile" "${ROOT}"
+
+mkdir -p "${ROOT}/out"
+
+docker run --rm \
+  -v "${ROOT}:/workspace" \
+  -w /workspace \
+  -e OTA_BASE_URL="${OTA_BASE_URL:-}" \
+  -e OTA_CHANNEL="${OTA_CHANNEL:-staging}" \
+  -e GRADLE_TASK="${GRADLE_TASK:-assembleDebug}" \
+  -e SKIP_NATIVE="${SKIP_NATIVE:-0}" \
+  -e SKIP_TESTS="${SKIP_TESTS:-0}" \
+  -e RELEASE_NOTES="${RELEASE_NOTES:-}" \
+  -e OUT_DIR=/workspace/out \
+  "$IMAGE" \
+  ./scripts/ci-build-and-publish-ota.sh
+
+echo ""
+echo "Done. APK: ${ROOT}/out/android_cast-latest.apk"
+if [[ -f "${ROOT}/out/BUILD_INFO.json" ]]; then
+  echo "OTA channel URL:"
+  sed -n 's/.*"channelUrl": "\([^"]*\)".*/\1/p' "${ROOT}/out/BUILD_INFO.json" | head -1
+fi