Add build automation and CI publishing workflow

scripts/update_site_metadata.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+BUILD_FILE="$ROOT_DIR/android/app/build.gradle.kts"
+META_DIR="$ROOT_DIR/website/assets/meta"
+APK_FILE="$ROOT_DIR/website/downloads/app-debug.apk"
+OUTPUT_FILE="$META_DIR/version.json"
+
+mkdir -p "$META_DIR"
+
+version_code="$(grep -E 'versionCode = [0-9]+' "$BUILD_FILE" | head -n1 | sed -E 's/.*versionCode = ([0-9]+)/\1/')"
+version_name="$(grep -E 'versionName = "[0-9]+\.[0-9]+\.[0-9]+"' "$BUILD_FILE" | head -n1 | sed -E 's/.*versionName = "([0-9]+\.[0-9]+\.[0-9]+)"/\1/')"
+build_date="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
+apk_size="$(stat -c %s "$APK_FILE")"
+
+cat > "$OUTPUT_FILE" <<EOF
+{
+  "versionName": "$version_name",
+  "versionCode": $version_code,
+  "buildDateUtc": "$build_date",
+  "apkPath": "downloads/app-debug.apk",
+  "apkSizeBytes": $apk_size
+}
+EOF
+
+echo "Site metadata updated: $version_name ($version_code)"