Initial: C# .NET 8 API + Dockerfile + Pipeline + K8s manifests

.gitignore

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+bin/
+obj/
+*.user
+*.suo
+.vs/

.woodpecker.yml

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+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: build
+    image: mcr.microsoft.com/dotnet/sdk:8.0
+    commands:
+      - dotnet restore
+      - dotnet build --no-restore
+      - dotnet publish -c Release -o /tmp/publish --no-restore
+
+  - name: docker
+    image: plugins/docker
+    settings:
+      registry: registry.ci-cd.svc.cluster.local:5000
+      repo: registry.ci-cd.svc.cluster.local:5000/demo/demo-api
+      tags:
+        - latest
+        - ${CI_COMMIT_SHA:0:8}
+      insecure: true
+
+  - name: deploy
+    image: bitnami/kubectl:latest
+    commands:
+      - kubectl set image deployment/demo-api api=registry.ci-cd.svc.cluster.local:5000/demo/demo-api:${CI_COMMIT_SHA:0:8} -n apps || echo "First deploy - will create"
+      - kubectl rollout status deployment/demo-api -n apps --timeout=60s || true

DemoApi.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+  </PropertyGroup>
+</Project>

Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+WORKDIR /src
+COPY *.csproj .
+RUN dotnet restore
+COPY . .
+RUN dotnet publish -c Release -o /app
+
+FROM mcr.microsoft.com/dotnet/aspnet:8.0
+WORKDIR /app
+COPY --from=build /app .
+EXPOSE 5000
+ENV ASPNETCORE_URLS=http://+:5000
+ENTRYPOINT ["dotnet", "DemoApi.dll"]

Program.cs

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+var builder = WebApplication.CreateBuilder(args);
+var app = builder.Build();
+
+app.MapGet("/", () => new {
+    service = "demo-api",
+    version = "1.0.0",
+    hostname = Environment.MachineName,
+    timestamp = DateTime.UtcNow
+});
+
+app.MapGet("/health", () => Results.Ok(new { status = "healthy" }));
+
+app.Run("http://0.0.0.0:5000");

k8s/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: demo-api
+  namespace: apps
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: demo-api
+  template:
+    metadata:
+      labels:
+        app: demo-api
+    spec:
+      containers:
+      - name: api
+        image: registry.ci-cd.svc.cluster.local:5000/demo/demo-api:latest
+        ports:
+        - containerPort: 5000
+        resources:
+          requests:
+            cpu: 10m
+            memory: 64Mi
+          limits:
+            memory: 256Mi
+        livenessProbe:
+          httpGet:
+            path: /health
+            port: 5000
+          initialDelaySeconds: 10
+        readinessProbe:
+          httpGet:
+            path: /health
+            port: 5000
+          initialDelaySeconds: 5
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: demo-api
+  namespace: apps
+spec:
+  selector:
+    app: demo-api
+  ports:
+  - port: 80
+    targetPort: 5000
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: demo-api
+  namespace: apps
+  annotations:
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+spec:
+  ingressClassName: traefik
+  rules:
+  - host: api.136.248.82.18.nip.io
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: demo-api
+            port:
+              number: 80
+  tls:
+  - hosts:
+    - api.136.248.82.18.nip.io
+    secretName: demo-api-tls