feat image: Add Dockerfile for CI pipeline image

Adds a simple Docker image that can be used in CI pipelines to deploy
`kontemplate`-based environments.

This image contains kontemplate and all of its dependencies (including
pass as an optional dependency).

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+Kontemplate Docker image
+========================
+
+This builds a simple Docker image available on the Docker Hub as `tazjin/kontemplate`.
+
+Builds are automated based on the Dockerfile contained here.
+
+It contains both `kontemplate` and `kubectl` and can be used as part of container-based
+CI pipelines.
+
+`pass` and its dependencies are also installed to enable the use of the `passLookup`
+template function if desired.