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feat: Add dig function #2

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feat: Add dig function #2

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Commits on Apr 8, 2021

  1. feat: Add dig function 

    **What**
- Add a `dig` function that can be used to verify DNS resultion inside a
  cluster. The function is implemented as a small bash script that
  invokes `dig` and then returns the result as JSON or text, depending
  on an ENV configuration. This function can also be used to demonstrate
  how to lightly wrap the CLI tool and provide some logging to stderr

To test

```sh
$ faas-cli build --filter dig
$ docker run --name digtest --rm -p 8080:8080 ghcr.io/openfaas/dig:latest
$ curl localhost:8080 -d "google.com"
{"ip_address": "172.217.23.110"}
$ docker kill digtest
```

Signed-off-by: Lucas Roesler <[email protected]>
    @LucasRoesler
    LucasRoesler committed Apr 8, 2021
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  2. bug: Fix CI docker login to GHCR 

    **What**
- Update the docker login step from CI to use the same login action we
  use in all of the other OpenFaaS CI workflows. This brings consistency
  and avoids issues with changes in the Docker CLI that prevented login
  via stdin

Signed-off-by: Lucas Roesler <[email protected]>
    @LucasRoesler
    LucasRoesler committed Apr 8, 2021
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