Add initial (and final) Dockerfile

Signed-off-by: Knut Ahlers <knut@ahlers.me>

Dockerfile

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+FROM cockroachdb/cockroach:latest
+CMD ["start-single-node", "--insecure"]

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>
+

README.md

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+## Why?
+
+- Github workflows do not allow to pass arguments to the service containers
+- `cockroachdb/cockroach` does not run without arguments
+
+It was either fuck around with Githubs workflows and try to create a container in their Docker network or create an image which is periodically rebuilt from `cockroachdb/cockroach:latest` and executes the `start-single-node --insecure` mode to create a running test-instance of CRDB for the Github workflows.
+
+Well. Here is the path I chose.