Add Docker containerization and local compose stack

.dockerignore

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+**/bin/
+**/obj/
+
+.git/
+.github/
+
+.vscode/
+.idea/
+
+*.user
+*.suo
+
+.DS_Store
+
+tests/
+
+README.md
+.gitignore

Dockerfile

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+# -------------------------
+# Build stage
+# -------------------------
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+
+WORKDIR /src
+
+COPY ["src/TransitPulse.API/TransitPulse.API.csproj", "src/TransitPulse.API/"]
+COPY ["src/TransitPulse.Application/TransitPulse.Application.csproj", "src/TransitPulse.Application/"]
+COPY ["src/TransitPulse.Domain/TransitPulse.Domain.csproj", "src/TransitPulse.Domain/"]
+COPY ["src/TransitPulse.Infrastructure/TransitPulse.Infrastructure.csproj", "src/TransitPulse.Infrastructure/"]
+
+RUN dotnet restore "src/TransitPulse.API/TransitPulse.API.csproj"
+
+COPY . .
+
+WORKDIR "/src/src/TransitPulse.API"
+
+RUN dotnet build "TransitPulse.API.csproj" \
+    --configuration Release \
+    --no-restore \
+    --output /app/build
+
+
+# -------------------------
+# Publish stage
+# -------------------------
+FROM build AS publish
+
+RUN dotnet publish "TransitPulse.API.csproj" \
+    --configuration Release \
+    --no-restore \
+    --output /app/publish \
+    /p:UseAppHost=false
+
+
+# -------------------------
+# Runtime stage
+# -------------------------
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS final
+
+WORKDIR /app
+
+COPY --from=publish /app/publish .
+
+EXPOSE 8080
+
+ENV ASPNETCORE_HTTP_PORTS=8080
+
+ENTRYPOINT ["dotnet", "TransitPulse.API.dll"]

compose.yml

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+services:
+  postgres:
+    image: postgres:17
+    container_name: transitpulse-postgres
+    environment:
+      POSTGRES_DB: transitpulse
+      POSTGRES_USER: transitpulse
+      POSTGRES_PASSWORD: transitpulse_dev_password
+    ports:
+      - "5432:5432"
+    volumes:
+      - transitpulse-postgres-data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U transitpulse -d transitpulse"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  api:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: transitpulse-api:local
+    container_name: transitpulse-api
+    depends_on:
+      postgres:
+        condition: service_healthy
+    environment:
+      ASPNETCORE_ENVIRONMENT: Development
+      ASPNETCORE_HTTP_PORTS: "8080"
+      ConnectionStrings__TransitPulseDb: "Host=postgres;Port=5432;Database=transitpulse;Username=transitpulse;Password=transitpulse_dev_password"
+      Jwt__SecretKey: "TransitPulse-Docker-Development-Secret-Key-2026"
+      Jwt__Issuer: "TransitPulse"
+      Jwt__Audience: "TransitPulseUsers"
+      Jwt__ExpiryMinutes: "60"
+    ports:
+      - "8080:8080"
+
+volumes:
+  transitpulse-postgres-data: