Dockerfile COPY with multiple sources needs trailing slash

[joebowbeer]

There are 7 instances in Dockerfiles in this repo:

https://github.com/search?q=repo%3Arestatedev%2Fexamples+Dockerfile+package*.json&type=code

Expected:

COPY package*.json ./

Actual:

COPY package*.json .

The requirement is:

https://docs.docker.com/reference/dockerfile/#source-1

If you specify multiple source files, either directly or using a wildcard, then the destination must be a directory (must end with a slash /).

There is no package-lock.json in these template folders, but anyone using these templates is likely to be bitten by this as soon as npm install generates a package-lock.json.