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Fix missing labels in Docker image

David Fifieldrequested to merge
dcf/snowflake:dockerfile-labels into main

Created on behalf of @dreua, who is currently unable to create an MR because of #40469 (closed) / tpo/tpa/team#42220 (closed).

Fixes #40468 (closed).

The Dockerfile adds some labels for podman-auto-update which I'd like to try using eventually. It looks to me like those labels don't end up in the final image, because they are declared in the wrong section of the multi-stage build.

$ podman image inspect containers.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake:latest 
[
     {
          "Id": "124127d241f548560791fb6df22f7c67b65634c2d247668d2c38c97cfe199c00",
[...]
          "Labels": null,

I created a patch to fix that, here's the result on a local build:

$ podman image inspect localhost/snowflake-testbuild-otherlabel:latest 
[...]
          "Labels": {
               "io.buildah.version": "1.40.1",
               "io.containers.autoupdate": "registry",
               "org.opencontainers.image.authors": "anti-censorship-team@lists.torproject.org"
          },

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