drop slapos.recipe.build:npm
This is not used, not tested and causes SyntaxWarning on python 3.8:
slapos/recipe/npm.py:128: SyntaxWarning: "is not" with a literal. Did you mean "!="?
if npm_process.returncode is not 0:This is not used, not tested and causes SyntaxWarning on python 3.8:
slapos/recipe/npm.py:128: SyntaxWarning: "is not" with a literal. Did you mean "!="?
if npm_process.returncode is not 0: