how to run:
$ docker compose up -d
$ docker compose exec ubuntu bash
# make
gnatmake main.adb
x86_64-linux-gnu-gcc-10 -c main.adb
x86_64-linux-gnu-gnatbind-10 -x main.ali
x86_64-linux-gnu-gnatlink-10 main.ali
./main
Hello, Ada!
OR
$ docker compose run --rm ubuntu make
docs: