Analysis

On my laptop, I can generate Hawaii.adl from within RAP3. As a result, a web application called "Hawaii" appears in the web server documents directory (D:\htdocs\Hawaii\index.php). Part of that application is a directory called "lib", in which the file autoload.php lives. The file bootstrap.php, from which this error originates, claims that autoload.php is the autoloader of Composer.
On Wolfram, which is being deployed on Azure by means of docker, that directory is missing.

I noticed that the lib directory is not in the static directory of the Ampersand compiler. That explains why docker did not make it.

Diagnosis

It appears that the environment variable "COMPOSER_HOME=/usr/local/bin/" should be set.
This solves the problem.

This environment variable has been added to the Dockerfile of Ampersand, so that this bug should not reappear.

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I closed this issue, because it is solved (with thanks to John Wentink)

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Somehow, adding the environment variable to the Dockerfile of Ampersand, did not work. This bug has reappeared. I checked the rap3-container and the environment variable is NOT set. Somehow the docker command ENV COMPOSER_HOME /usr/local/bin/ is located in the wrong place or is misformulated.

@wentinkj, ik heb jou even aangehaakt, maar ik bel je er nog over op. Groetjes, Stef

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