npm needs to be in a separate run step, don't ask why

Dockerfile

@@ -73,6 +73,9 @@ RUN apt-get update && \
         nodejs && \
     rm -rf /var/lib/apt/lists/*
 
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends npm
+
 # npm's self-signed CA is no more
 # https://blog.npmjs.org/post/78085451721/npms-self-signed-certificate-is-no-more
 RUN npm config -g set ca ""