Do not hard code the log file

We log to file only if WATCHDOG_LOG is set, otherwise we output to
stdout as usual.

status-check.sh

@@ -5,6 +5,8 @@
 # Any servers in URLS that yield a bad response are collated and sent via email
 # to all RECIPIENTS.
 #
+# If WATCHDOG_LOG is set, all output will be redirected there.
+#
 # Dependencies
 # - curl:  Polling the servers
 # - msmtp: Sending email; requires separate configuration
@@ -12,8 +14,6 @@
 
 #set -eux
 
-LOG_FILE="/media/workshop/Projects/openmedianetwork/.omn_watchdog.log"
-
 RECIPIENTS=(
     saunders@openworlds.info
     witchescauldron@openworlds.info
@@ -44,10 +44,12 @@ main()
 {
     declare -A FLAGGED
 
-    rotate_log LOG_FILE
-    # Redirect all output to LOG_FILE but preserve a link to stdout should we
-    # still want to use it
-    exec 3>&1 1>>${LOG_FILE} 2>&1
+    if [ -n "${WATCHDOG_LOG}" ]; then
+        rotate_log WATCHDOG_LOG
+        # Redirect all output to WATCHDOG_LOG but preserve a link to stdout should we
+        # still want to use it
+        exec 3>&1 1>>${WATCHDOG_LOG} 2>&1
+    fi
 
     echo ">> $(date)"
     echo "== Checking:"