preload grafana dashboard with docker-compose setup

[jeevananthank]

Today's setup of docker-compose does not preload the dashboard when running the tests locally. This PR solves the issues and detailed description is in the link below.

The grafana dashboard used here is more generic and simple and one can update as per their needs.

https://community.k6.io/t/preload-grafana-dashbaord-with-docker-compose-setup/874

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #1610 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1610   +/-   ##
=======================================
  Coverage   74.82%   74.82%           
=======================================
  Files         164      164           
  Lines       14035    14035           
=======================================
  Hits        10501    10501           
  Misses       3002     3002           
  Partials      532      532           

Impacted Files	Coverage Δ
lib/testutils/minirunner/minirunner.go	78.57% <0.00%> (-3.58%)	⬇️
lib/executors.go	94.11% <0.00%> (+1.96%)	⬆️

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[mstoykov]

LGTM!

I have some reservations about us putting, even more, grafana specific things in the k6 repo ... because even now people ask us questions that are grafana/influxdb related. And to be perfectly honest I don't think we should be the one trying to answer them, and usually, it requires that we go read the grafana/influxdb documentation to figure it out, which arguably should be what, the person who asked the question, have done in the first place.

[simskij]

Looks good to me! I share your concern @mstoykov, but suggest we merge this for now and continue the discussions about whether to split this out to another repo in a separate forum.

[na--]

I haven't actually tried the new default dashboard, but considering we're soon going to move the docker-compose files to a separate example repo (#1614), LGTM 😅

[simskij]

Thank you so much for your contribution, @jeevananthank! 🙏🏼