Fix empty grafana dashboards

[puffitos]

Motivation

Closes #10

I've also updated the chart version and made building the charts possible only on the main branch.

Tests done

I've tested the base query:

sum by (container_namespace)(
  (
    increase(kepler_container_dram_joules_total{container_namespace=~".*", pod_name=~".*"}[24h:1m]) +
    increase(kepler_container_other_joules_total{container_namespace=~".*", pod_name=~".*"}[24h:1m]) +
    increase(kepler_container_package_joules_total{container_namespace=~".*", pod_name=~".*"}[24h:1m])
  ) * 0.000000277777777777778
)

As well as the other [1m] -> [5m] queries. The all seem to work.

[eumel8]

great! thx!