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

netdisco/docker-compose.yml

@@ -0,0 +1,44 @@
+services:
+  netdisco-postgresql:
+    image: netdisco/netdisco:2.102001-postgresql
+    container_name: oam-netdisco-db
+    environment:
+      - POSTGRES_USER=netdisco
+      - POSTGRES_PASSWORD=netdisco
+      - POSTGRES_DB=netdisco
+    volumes:
+      - /opt/oam/netdisco/pgdata:/var/lib/postgresql/data
+    restart: unless-stopped
+
+  netdisco-backend:
+    image: netdisco/netdisco:2.102001-backend
+    container_name: oam-netdisco-backend
+    depends_on:
+      - netdisco-postgresql
+    environment:
+      - NETDISCO_DB_HOST=netdisco-postgresql
+      - NETDISCO_DB_NAME=netdisco
+      - NETDISCO_DB_USER=netdisco
+      - NETDISCO_DB_PASS=netdisco
+      - NETDISCO_SNMP_COMMUNITY=kn3lmgmt
+    volumes:
+      - /opt/oam/netdisco/config/deployment.yml:/home/netdisco/environments/deployment.yml
+      - /opt/oam/netdisco/data:/home/netdisco/netdisco-sqlite
+    restart: unless-stopped
+
+  netdisco-web:
+    image: netdisco/netdisco:2.102001-web
+    container_name: oam-netdisco-web
+    depends_on:
+      - netdisco-postgresql
+      - netdisco-backend
+    environment:
+      - NETDISCO_DB_HOST=netdisco-postgresql
+      - NETDISCO_DB_NAME=netdisco
+      - NETDISCO_DB_USER=netdisco
+      - NETDISCO_DB_PASS=netdisco
+    ports:
+      - "8082:5000"
+    volumes:
+      - /opt/oam/netdisco/config/deployment.yml:/home/netdisco/environments/deployment.yml
+    restart: unless-stopped