add custom promtail image

promtail/Dockerfile

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+FROM grafana/promtail:main
+
+COPY ./config.yml /etc/promtail/config.yaml
+
+ENTRYPOINT ["promtail", "--config.file=/etc/promtail/config.yaml", "--config.expand-env=true"]

promtail/README.md

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+# Promtail
+
+## Usage
+
+Run using docker:
+
+```sh
+docker run -v /var/run/docker.sock:/var/run/docker.sock \
+    -e LOKI_PUSH_URL="<domain>/loki/api/v1/push" \
+    -e LOKI_PUSH_USER="<user>" \
+    -e LOKI_PUSH_PASSW="<password>" \
+    -e DOCKER_HOST="/var/run/docker.sock" \
+    -e INSTANCE_NAME="HelloWorld" \
+    scalableminds/promtail
+```
+
+This will scrape all containers with label `gather.logs=true`.
+
+## Configuration
+
+Environment Variables:
+
+| Name | Description |
+|------|-------------|
+| `LOKI_PUSH_URL` | URL to push to (e.g. `<domain>/loki/api/v1/push`) |
+| `LOKI_PUSH_USER` | User for Basic Auth |
+| `LOKI_PUSH_PASSW` | Password for Basic Auth |
+| `DOCKER_HOST` | Path to docker host (e.g. `unix:///var/run/docker.sock`) |
+| `INSTANCE_NAME` | Name of the instance |

promtail/config.yml

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+server:
+  disable: true
+clients:
+- url: ${LOKI_PUSH_URL}
+  basic_auth:
+    username: ${LOKI_PUSH_USER}
+    password: ${LOKI_PUSH_PASSW}
+scrape_configs:
+- job_name: docker
+  docker_sd_configs:
+  - host: ${DOCKER_HOST}
+  relabel_configs:
+  - source_labels: ['__meta_docker_container_name']
+    regex: '/(.*)'
+    target_label: 'container'
+  - source_labels: ['__meta_docker_container_label_gather_logs']
+    regex: 'true'
+    action: 'keep'
+  - source_labels: ['__meta_docker_container_label_gather_logs']
+    regex: '.*'
+    target_label: 'instance'
+    replacement: ${INSTANCE_NAME}