Improve Helm chart: labels, pod monitor, additional env vars #948

Job	Run time
Unit test code	17s
Verify templating chart with default values	4s
Lint code	21s
Lint Helm chart	4s
Test integration with Prometheus	2m 3s
Verify that Helm README is up to date	19s
Verify that Makefile section of README is up to date	3s
Build Linux binary	29s
Build Windows binary	0s
Build Linux ARM binary	0s
Build Mac binary	0s
Build Linux Docker image	32s
Build Linux ARM Docker image	0s
Test integration with Helm chart	0s
Create GitHub release	0s
upload-binaries	0s
	4m 12s

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