chore: initial import from KNEL/PFVCluster@041d311 [#769]

Split per O&M lane work order. Full history: KNEL/PFVCluster.
shellcheck debt fixed in librenms-agent (quoting, arithmetic, backticks);
fixes upstream ntp-server.sh bug: input_wakeups reported PACKETSENDFAILURES
instead of INPUTWAKEUPS. mysql.sh (PHP-in-.sh) exempt per house rule.

https://projects.knownelement.com/issues/769#note-4152

smokeping/docker-compose.yml

@@ -0,0 +1,14 @@
+services:
+  smokeping:
+    image: linuxserver/smokeping:2.9.0
+    container_name: oam-smokeping
+    environment:
+      - PUID=1000
+      - PGID=1000
+      - TZ=America/Chicago
+    volumes:
+      - /opt/oam/smokeping/config:/config
+      - /opt/oam/smokeping/data:/data
+    ports:
+      - "8081:80"
+    restart: unless-stopped