feat(dummyhttp): first version of the application

dummyhttp/README.md

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+# Dummyhttp kustomize application
+
+This application deploys a container that runs an instance of the [dummyhttp](https://github.com/svenstaro/dummyhttp)
+application that returns a string that uses environment variables added to the container from a `ConfigMap` and a
+`Secret`.
+
+The container image is built from a generic
+[Dockerfile](https://forgejo.mixinet.net/oci/images/src/tag/dummyhttp-v1.0.0/dummyhttp/Dockerfile) that runs the
+application directly, but we have modified the arguments on the `Deployment` to be able to use environment variables on
+the arguments to the server (we use `/bin/sh -c` as entrypoint and the command uses `eval` to expand the environment
+variables when calling the application).
+
+The base application includes a `Deployment`, a `Service` and an `Ingress` definition; the `Deployment` uses environment
+variables from a `ConfigMap` and a `Secret` if they are available, but we've marked them as optional to be able to
+deploy the application without having them available.