Usage :
First parameter => php version
Second parameter (optional) => image variant
./build.sh 7.4 [apache|cli]
./build.sh 8.0 [apache|cli]
./build.sh 8.1 [apache|cli]
./build.sh 8.2 [apache|cli]
./build.sh 8.3 [apache|cli]
./build.sh 8.4 [apache|cli]