Added mcp tests to github CI, added alpine image for metrics service. Minor updates

[LorenzoTettamanti]

Changes

1. Added Test MCP CI pipeline (tests introduced in Labels on Metadata are able to identify the workload a series belongs to #231)
2. Added alpine image for metrics service, see Docker.alpine and metrics-build-alpine.sh
3. Updated testing/prometheus-yaml and Examples/run-with-docker/docker-compose.yaml file
4. Minor bug fix in cli/src/errors.rs

Tests

Input: cfcli monitoring otel-live

Output(Trimmed):

`=====> Connecting to OpenTelemetry collector

HELP cortexbrain_bytes_alloc_events_total Total bytes_alloc events occurring in the CPU

TYPE cortexbrain_bytes_alloc_events_total counter

cortexbrain_bytes_alloc_events_total{command="cilium-cni",job="cortexflow/cortexflow-metrics",tgid="66058"} 1
cortexbrain_bytes_alloc_events_total{command="code",job="cortexflow/cortexflow-metrics",tgid="5706"} 2
cortexbrain_bytes_alloc_events_total{command="code",job="cortexflow/cortexflow-metrics",tgid="66068"} 2
cortexbrain_bytes_alloc_events_total{command="code",job="cortexflow/cortexflow-metrics",tgid="66180"} 1
cortexbrain_bytes_alloc_events_total{command="cri-dockerd",job="cortexflow/cortexflow-metrics",tgid="66058"} 2
cortexbrain_bytes_alloc_events_total{command="docker",job="cortexflow/cortexflow-metrics",tgid="66068"} 1
cortexbrain_bytes_alloc_events_total{command="dockerd",job="cortexflow/cortexflow-metrics",tgid="41691"} 2
cortexbrain_bytes_alloc_events_total{command="kubectl",job="cortexflow/cortexflow-metrics",tgid="66015"} 2
cortexbrain_bytes_alloc_events_total{command="kubectl",job="cortexflow/cortexflow-metrics",tgid="66080"} 3
cortexbrain_bytes_alloc_events_total{command="sh",job="cortexflow/cortexflow-metrics",tgid="66080"} 2
cortexbrain_bytes_alloc_events_total{command="sh",job="cortexflow/cortexflow-metrics",tgid="66138"} 1
cortexbrain_bytes_alloc_events_total{command="snap",job="cortexflow/cortexflow-metrics",tgid="66015"} 3
cortexbrain_bytes_alloc_events_total{command="snap",job="cortexflow/cortexflow-metrics",tgid="66033"} 2
cortexbrain_bytes_alloc_events_total{command="snap",job="cortexflow/cortexflow-metrics",tgid="66039"} 2
cortexbrain_bytes_alloc_events_total{command="snap",job="cortexflow/cortexflow-metrics",tgid="66040"} 2
cortexbrain_bytes_alloc_events_total{command="snap",job="cortexflow/cortexflow-metrics",tgid="66041"} 2
cortexbrain_bytes_alloc_events_total{command="snap",job="cortexflow/cortexflow-metrics",tgid="66080"} 2
cortexbrain_bytes_alloc_events_total{command="snap",job="cortexflow/cortexflow-metrics",tgid="66138"} 1
cortexbrain_bytes_alloc_events_total{command="snap",job="cortexflow/cortexflow-metrics",tgid="66164"} 2
cortexbrain_bytes_alloc_events_total{command="snap-confine",job="cortexflow/cortexflow-metrics",tgid="66080"} 2
cortexbrain_bytes_alloc_events_total{command="snap-exec",job="cortexflow/cortexflow-metrics",tgid="66080"} 3
cortexbrain_bytes_alloc_events_total{command="snap-seccomp",job="cortexflow/cortexflow-metrics",tgid="66033"} 1
cortexbrain_bytes_alloc_events_total{command="systemd",job="cortexflow/cortexflow-metrics",tgid="1436"} 6
cortexbrain_bytes_alloc_events_total{command="watch",job="cortexflow/cortexflow-metrics",tgid="66079"} 2

[siddh34]

@LorenzoTettamanti I am reviewing it by tomorrow morning IST I will be done!

[LorenzoTettamanti]

@siddh34 fixed! Sorry for the delay

[siddh34]

@siddh34 fixed! Sorry for the delay

No worries mate!
I still want to test otel out if something fails we will change the otel in a later PR

I will be done testing by 11 pm IST

Let me know if you had tested the compose out incase ready to approve PR looks good to me

[LorenzoTettamanti]

@siddh34 I found and fixed an issue with otel-collector-contrib:0.162.0. Now everything is working fine

[siddh34]

LGTM mate!