What worked for me was removing the command in app.dockerfile that validates the composer-setup file hash starting with: "&& php -r "if(hash_file...", or changing it to the correct hash (see the entry under "4. RUN" in the article), and then executing the docker-compose up command from the root directory of your laravel app.
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What worked for me was removing the command in app.dockerfile that validates the composer-setup file hash starting with: "&& php -r "if(hash_file...", or changing it to the correct hash (see the entry under "4. RUN" in the article), and then executing the docker-compose up command from the root directory of your laravel app.