Enable pushing to ghcr.io on merge to master

[mikkeloscar]

This adds a step to push a :latest tag to ghcr.io on every merge to master.
It also changes the push with tag to only trigger when there is a tag created.

Fix #624

[zalando-robot]

Docker image "container-registry-test.zalando.net/teapot/kube-metrics-adapter-test:sha256:16e0885f615504f93bf89b83810dbc8231bdc443bc11af027aff4ca0fbd8dc1b" is not based on an approved base image. Any production deployment relying on this image will be blocked.

To create a compliant Docker image of your application, you must reference an allowed Docker image as its base image in your Dockerfile. This base image must come from the Open Source Registry namespace library and use a recommended version as listed in the documentation.

[zalando-robot]

Docker image "container-registry-test.zalando.net/teapot/kube-metrics-adapter-test:sha256:89a912a437d1943016a9555ed0ab1f42f88f7c2a0c596265b362efbcecb05b45" is not based on an approved base image. Any production deployment relying on this image will be blocked.

To create a compliant Docker image of your application, you must reference an allowed Docker image as its base image in your Dockerfile. This base image must come from the Open Source Registry namespace library and use a recommended version as listed in the documentation.

[zalando-robot]

Docker image "container-registry-test.zalando.net/teapot/kube-metrics-adapter-test:sha256:1d554586343b0a563cb39e7ecd316e5013bf966efb7656165a435897a881a589" is not based on an approved base image. Any production deployment relying on this image will be blocked.

To create a compliant Docker image of your application, you must reference an allowed Docker image as its base image in your Dockerfile. This base image must come from the Open Source Registry namespace library and use a recommended version as listed in the documentation.

[zalando-robot]

Docker image "container-registry-test.zalando.net/teapot/kube-metrics-adapter-test:sha256:6b1d9a350284de01303e8930836ed07c474b5ca9d0d06d0f4f44b20027028bd0" is not based on an approved base image. Any production deployment relying on this image will be blocked.

To create a compliant Docker image of your application, you must reference an allowed Docker image as its base image in your Dockerfile. This base image must come from the Open Source Registry namespace library and use a recommended version as listed in the documentation.

[mikkeloscar]

👍

[szuecs]

👍