Add RTLSDR-Airband Docker deployment config

docker-compose.yml runs ghcr.io/rtl-airband/rtlsdr-airband:latest with
USB passthrough and recording volume mount. rtl_airband.conf monitors
3 EU CB channels (CH3, CH7, CH10) with NFM, bandwidth=8000, correction=-1,
split_on_transmission, and dated subdirectories.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,10 @@
+services:
+  rtlsdr-airband:
+    image: ghcr.io/rtl-airband/rtlsdr-airband:latest
+    container_name: sdr-recorder
+    restart: unless-stopped
+    devices:
+      - /dev/bus/usb:/dev/bus/usb
+    volumes:
+      - ./rtl_airband.conf:/app/rtl_airband.conf:ro
+      - /home/m/recordings:/recordings

rtl_airband.conf

@@ -0,0 +1,64 @@
+# RTLSDR-Airband configuration for EU CB radio monitoring
+# Channels: 3 (26.985 MHz), 7 (27.035 MHz), 10 (27.075 MHz)
+
+localtime = true;
+
+devices:
+({
+  type = "rtlsdr";
+  index = 0;
+  gain = 12.5;
+  centerfreq = 27.035;
+  correction = -1;
+  mode = "multichannel";
+  sample_rate = 2.56;
+
+  channels:
+  (
+    {
+      freq = 26.985;
+      bandwidth = 8000;
+      modulation = "nfm";
+      label = "CB-CH03";
+      outputs: (
+        {
+          type = "file";
+          directory = "/recordings";
+          filename_template = "CB_CH03_26985";
+          split_on_transmission = true;
+          dated_subdirectories = true;
+        }
+      );
+    },
+    {
+      freq = 27.035;
+      bandwidth = 8000;
+      modulation = "nfm";
+      label = "CB-CH07";
+      outputs: (
+        {
+          type = "file";
+          directory = "/recordings";
+          filename_template = "CB_CH07_27035";
+          split_on_transmission = true;
+          dated_subdirectories = true;
+        }
+      );
+    },
+    {
+      freq = 27.075;
+      bandwidth = 8000;
+      modulation = "nfm";
+      label = "CB-CH10";
+      outputs: (
+        {
+          type = "file";
+          directory = "/recordings";
+          filename_template = "CB_CH10_27075";
+          split_on_transmission = true;
+          dated_subdirectories = true;
+        }
+      );
+    }
+  );
+});