Fix execution scheduling (#7)

**Dockerfile**
- Fix `CRON_TIME`.

**backup.sh**
- Remove `TIMESTAMP` variable.
- Change how `date` is displayed when `echo`ing.

Dockerfile

@@ -9,7 +9,7 @@ RUN apk add --no-cache \
     xz \
     tzdata
 
-ENV CRON_TIME "* */12 * * *"
+ENV CRON_TIME "0 */12 * * *"
 ENV UID 100
 ENV GID 100
 ENV CRONFILE /etc/crontabs/root

backup.sh

@@ -1,11 +1,8 @@
 #!/bin/sh
 cd /
 
-# Store current date in a variable.
-TIMESTAMP=$(date "+%F_%H-%M-%S")
-
 # Store new backup archive location in a variable.
-BACKUP_LOCATION=/backups/$TIMESTAMP.tar.xz
+BACKUP_LOCATION=/backups/$(date +"%F_%H-%M-%S").tar.xz
 
 # Create variables for the files and directories to be archived.
 BACKUP_DB=db.sqlite3 # file
@@ -15,6 +12,6 @@ BACKUP_ATTACHMENTS=attachments # directory
 BACKUP_SENDS=sends # directory
 
 # Create an archive of the files and directories.
-echo "Starting backup at ${TIMESTAMP}..."
+echo "[INFO] Starting backup at $(date +"%F %r")..."
 cd /data && tar -Jcf $BACKUP_LOCATION $BACKUP_DB $BACKUP_RSA $BACKUP_CONFIG $BACKUP_ATTACHMENTS $BACKUP_SENDS 2>/dev/null && cd /
-echo "Backup completed at ${TIMESTAMP}."
+echo "[INFO] Backup completed at $(date +"%F %r")."

entrypoint.sh

@@ -29,5 +29,5 @@ if [ "$(id -u)" -eq 0 ]; then
   exec su-exec app:app "$0" "$@"
 fi
 
-echo "$(date "+%F %T") - Container started" > "$LOGFILE"
+echo "[INFO] Container started at $(date +"%F %r")" > "$LOGFILE"
 tail -F "$LOGFILE" /app/log/cron.log