devenv: loki: remove unused devenv-config (#55752)

* devenv: jaeger: add it's own copy of promtail-config

* devenv: removed unused loki config

devenv/docker/blocks/jaeger/docker-compose.yaml

@@ -25,7 +25,7 @@
   promtail:
     image: grafana/promtail:master
     volumes:
-      - ./docker/blocks/loki-promtail/promtail-config.yaml:/etc/promtail/docker-config.yaml
+      - ./docker/blocks/jaeger/promtail-config.yaml:/etc/promtail/docker-config.yaml
       - /var/log:/var/log
       - ../data/log:/var/log/grafana
     command:

devenv/docker/blocks/loki-promtail/README.md

@@ -1,18 +0,0 @@
-By default this block is setup to scrape logs from /var/logs. If you need to log some service from the docker-compse you can add:
-```
-    # For this to work you need to install the logging driver see https://github.com/grafana/loki/tree/master/cmd/docker-driver#plugin-installation
-    logging:
-      driver: loki
-      options:
-        loki-url: "http://loki:3100/loki/api/v1/push"
-```
-
-This also works for self logging Loki logs if you use `http://localhost:3100/loki/api/v1/push`. This is useful together with  
-```
-    environment:
-      - JAEGER_AGENT_HOST=tempo
-      - JAEGER_AGENT_PORT=6831
-      - JAEGER_SAMPLER_TYPE=const
-      - JAEGER_SAMPLER_PARAM=1
-```
-which sets up a tracing and so you will have logs with traceIDs to test linking between logs and traces.

devenv/docker/blocks/loki-promtail/docker-compose.yaml

@@ -1,14 +0,0 @@
-  # datasource URL: http://localhost:3100/
-  loki:
-    image: grafana/loki:latest
-    ports:
-      - "3100:3100"
-    command: -config.file=/etc/loki/local-config.yaml
-  promtail:
-    image: grafana/promtail:latest
-    volumes:
-      - ./docker/blocks/loki-promtail/promtail-config.yaml:/etc/promtail/docker-config.yaml
-      - /var/log:/var/log
-      - ../data/log:/var/log/grafana
-    command:
-      -config.file=/etc/promtail/docker-config.yaml