Container: Add initial container for meshtastic-cli

Just a quick set of files to enable the build of (tagged) containers.
Both alpine and debian containers are available (~200MiB/~1.2GiB)
allowing us to use meshtastic cli with a quick docker run, instead of
having to build/install stuff locally.

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>

.dockerignore

@@ -0,0 +1,10 @@
+*
+!Containerfile*
+!Dockerfile
+!README.md
+!bin/container-entrypoint.sh
+!examples/
+!extra/
+!meshtastic/
+!poetry.lock
+!pyproject.toml