Adds delay to allow mysql to provision before starting application

[vitaleg]

Fixes a problem where on first run the application tries to create tables in the database before the mysql server is ready.

[hackeresq]

Appreciate the thoughtful PR!

Curious on the 1 second interval. What are you thoughts on increasing that to 30 seconds?

[vitaleg]

I think 30s is too much. Maybe 10s would be optimal.
At the same time, don't forget that the start-period parameter gives time before the checks are executed.

[hackeresq]

Hi @vitaleg, thanks for your contribution. While I've added your depends_on to the app service, I had decided to adopt a different solution in the entrypoint.sh, which uses bash. Frankly I'm much more competent in bash (and will likely be more maintainable over time):

echo "====================== Running migrations...  ====================== "
run_migrations() {
    /usr/local/bin/php artisan migrate --force
}
RETRIES=30
DELAY=5
until run_migrations; do
  RETRIES=$((RETRIES-1))
  if [ $RETRIES -le 0 ]; then
    echo "Database is not ready after multiple attempts. Exiting..."
    exit 1
  fi
  echo "Waiting for database to be ready... retrying in $DELAY seconds."
  sleep $DELAY
done