Setup custom prometheus docker image that should be deployed to railway

.dockerignore

@@ -0,0 +1,4 @@
+.idea
+.vscode
+.fleet
+dubs-bot.iml

.github/workflows/build-prometheus-docker-image.yml

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+name: Build Prometheus Docker image
+
+on:
+  push:
+    paths:
+      - prometheus/**
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: docker/setup-buildx-action@v3
+        with:
+          install: true
+
+      - name: Login to container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          context: ./prometheus
+          tags: ghcr.io/jirkavrba/dubs-bot/prometheus:latest

docker-compose.yml

@@ -17,4 +17,4 @@ services:
     ports:
       - "9090:9090"
     volumes:
-      - "./docker/prometheus.yml:/etc/prometheus/prometheus.yml"
+      - "./prometheus/prometheus-local.yml:/etc/prometheus/prometheus.yml"

prometheus/Dockerfile

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+FROM prom/prometheus:latest
+
+COPY ./prometheus-railway.yml /etc/prometheus/prometheus.yml

prometheus/prometheus-railway.yml

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+scrape_configs:
+  - job_name: prometheus
+    honor_labels: true
+    static_configs:
+      - targets:
+        - "api.railway.internal"
+    scrape_interval: 30s
+    scrape_timeout: 5s
+    body_size_limit: 10MB
+    sample_limit: 1000
+    target_limit: 35
+    label_limit: 35
+    label_name_length_limit: 210
+    label_value_length_limit: 210
+    metrics_path: /prometheus
+    scheme: http