Revert "Remove test dependency too"

This reverts commit db12bb5db1.

Revert "Remove py-tests and pypi to speed up docker validation"

This reverts commit 9aa77b3739.

Starlark provides more advanced generation of build pipelines.

https://docs.drone.io/starlark/overview/

Make image more stable and slim by removing cache and pinning versions

No meaningful changes otherwise. :)

Accidentally referenced arm instead of arm64

Done to show non-root usage and more inbuilt utilities

Fixing this by switching to tox outside the venv

Also adding more python versions

Now deploy both to pypi and docker hub after all tests pass

Default  ERROR
    -v       WARNING
    -vv      INFO
    -vvv     DEBUG

* Correct env variable name in minitor_test
* Adding more test environments, skipping python 3.5
because lack of assert_called_once support
* Using default travis python environments

These are bundled within the Docker image to make it possible to alert
on status of other Docker containers.

Will potentially include other sets of "standard" scripts for
convenience sake.

It looks like yamlenv doesn't parse quite correctly and seems to think
the `:` removed in this diff is defining a new object.

I believe it has something to do with a change in yamlenv 0.6.0 to allow
interpolating env variables as yaml literals.

dcb1223159

Metrics got broken when counters were moved to be initialized below the monitor creation