feat(grafana): add env parameter for grafana component

scripts: include kube-rbac-proxy and config-reloader in version upgrades

Fix adding private repository

`imageRepos` field was removed and the project no longer tries to compose image strings. Now the libraries use `$.values.common.images` to override default images.

Signed-off-by: paulfantom <pawel@krupa.net.pl>

Enable tests for kubernetes 1.21

jsonnet: drop storage_operation_errors_total and storage_operation_status_count as those are deprecated in k8s 1.21

Signed-off-by: paulfantom <pawel@krupa.net.pl>

Unpin jsonnet dependencies

Improvements in addMixin function.

Signed-off-by: paulfantom <pawel@krupa.net.pl>

This change updates the version of kubeconform to 0.4.7. It simplifies the
`validate` Makefile target and extracts the kubernetes version into a variable.

*: add test of mixin addition in examples/; change config to `_config` in addMixin to be consistent with main components

jsonnet/components: fix missing resource config in blackbox exporter

jsonnet/kube-prometheus/addons: fix KSM regex patterns

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

jsonnet: use common to populate options for additional objects

Add PodDisruptionBudget to prometheus-adapter

Adding a PodDisruptionBudget to prometheus-adapter ensure that at least
one replica of the adapter is always available. This make sure that even
during disruption the aggregated API is available and thus does not
impact the availability of the apiserver.

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>