PMM-12693 Run grafana as non-root

[ademidoff]

https://jira.percona.com/browse/PMM-12693

percona/pmm#2648

[JNKPercona]

server docker - perconalab/pmm-server-fb:PR-3465-449b6a5
client docker - perconalab/pmm-client-fb:PR-3465-449b6a5
client - https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-3465-449b6a5.tar.gz
Create Staging Instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-3465-449b6a5&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-3465-449b6a5.tar.gz

[JNKPercona]

API tests have failed, Please check: API: https://pmm.cd.percona.com/job/pmm-api-tests/34/

[JNKPercona]

server docker - perconalab/pmm-server-fb:PR-3465-4dafad7
client docker - perconalab/pmm-client-fb:PR-3465-4dafad7
client - https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-3465-4dafad7.tar.gz
Create Staging Instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-3465-4dafad7&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-3465-4dafad7.tar.gz

[JNKPercona]

API tests have failed, Please check: API: https://pmm.cd.percona.com/job/pmm-api-tests/35/