Auto-merge pull request #289 from atomist-skills/npm-build-skill

Re-pin Docker base image in Dockerfile
    
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Author: atomist[bot]

Dockerfile

@@ -9,7 +9,7 @@ RUN npm ci --no-optional && \
     npm run compile && \
     rm -rf node_modules .git
 
-FROM ubuntu:rolling@sha256:18f63cbe22f65810c15453f050cb64603193264b039661389efb2cd20f2b236a
+FROM ubuntu:rolling@sha256:b6b83d3c331794420340093eb706a6f152d9c1fa51b262d9bf34594887c2c7ac
 
 # tools
 RUN apt-get update && apt-get install -y \