Move to Alpine linux

Based on https://github.com/sanjeevan/baseimage

Image size reduced from 232MB to 90MB

Also make the change monitors more like services that restart if they crash

60_create_monitors.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+function ts {
+  echo [`date '+%Y-%m-%d %H:%M:%S'`] MASTER:
+}
+
+echo "$(ts) Starting master controller"
+
+if [ -f /config/sample.conf ]; then
+  echo "$(ts) /config/sample.conf exists. Rename it to <monitor name>.conf, check the settings, then rerun the container. Exiting."
+  exit 1
+fi
+
+readarray -t CONFIG_FILES < <(ls /config/*.conf)
+
+# If there is no config file copy the default one
+if [[ "$CONFIG_FILES" == "" ]]
+then
+  echo "$(ts) Creating sample config file. Rename it to <monitor name>.conf, check the settings, then rerun the container. Exiting."
+  cp /files/sample.conf /config/sample.conf
+  chmod a+w /config/sample.conf
+  exit 1
+fi
+
+for CONFIG_FILE in "${CONFIG_FILES[@]}" 
+do 
+  FILENAME=$(basename "$CONFIG_FILE")
+
+  echo "$(ts) Creating monitor for $FILENAME"
+
+  FILEBASE="${FILENAME%.*}"
+  
+  mkdir -p /etc/service/$FILEBASE
+
+  cat > /etc/service/$FILEBASE/run <<EOF
+#!/bin/bash
+
+/files/monitor.py "$CONFIG_FILE"
+EOF
+
+  chmod a+x /etc/service/$FILEBASE/run
+done