Add monitoring of scripts through healthchecks.io

Updates the README with more cron script setup instructions.

scripts/update.sh

@@ -1,4 +1,40 @@
 #!/bin/bash
+set -e
+set -o pipefail
+
+# Load environment variables
+export $(grep -v '^#' .env | xargs -d '\n')
+
+# Generate UUID for this run
+RID=$(cat /proc/sys/kernel/random/uuid)
+
+# Healthchecks.io ping function
+ping_healthcheck() {
+    local endpoint="$1"
+    local data="$2"
+    if [ -n "$data" ]; then
+        curl -fsS -m 10 --retry 5 --data-raw "$data" "https://hc-ping.com/${HEALTHCHECK_PING_KEY}/modmapper-update${endpoint}?rid=${RID}" >/dev/null || true
+    else
+        curl -fsS -m 10 --retry 5 "https://hc-ping.com/${HEALTHCHECK_PING_KEY}/modmapper-update${endpoint}?rid=${RID}" >/dev/null || true
+    fi
+}
+
+# Send failure notification with logs
+send_failure() {
+    local logs=""
+    if [ -f logs/modmapper.log ]; then
+        logs=$(tail --bytes=100000 logs/modmapper.log)
+    fi
+    ping_healthcheck "/fail" "$logs"
+    exit 1
+}
+
+# Trap to catch failures
+trap send_failure ERR
+
+# Send start ping
+ping_healthcheck "/start"
+
 if [ -f cells/edits.json ]; then
     last_update_time=$(date -r cells/edits.json +'%Y-%m-%dT%H:%M:%S')
 fi
@@ -29,4 +65,7 @@ else
     ./target/release/mod-mapper -m mods &>> logs/modmapper.log
     ./target/release/mod-mapper -P plugins_data &>> logs/modmapper.log
     ./target/release/mod-mapper -F files &>> logs/modmapper.log
-fi
+fi
+
+# Send success ping
+ping_healthcheck ""