Handle SMALLTALK_CI_BUILD variable for GitHub actions like Travis and Appveyor
Handle SMALLTALK_CI_BUILD variable for GitHub actions like Travis and Appveyor

hpi-swa/filetreeCI,hpi-swa/smalltalkCI,fniephaus/filetreeCI,hpi-swa/filetreeCI,fniephaus/filetreeCI,hpi-swa/filetreeCI,fniephaus/filetreeCI,hpi-swa/smalltalkCI