Docker image should accept optional flags as ENV variables

[mstump]

With the current docker image there is no way to pass additional command line flags such as -web.external-url. Instead of invoking prometheus directly the image should invoke a shell script, optionally passing command line variables if they're specified in the environment.

[andrestc]

Couldn't you just pass this cmd line flags directly to docker run? Those would override the CMD entry of the Dockerfile and will be fed directly to the ENTRYPOINT (prometheus binary).

[mstump]

you are correct.

[lock]

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