Add Dockerfile and Manifests

Dockerfile

@@ -0,0 +1,62 @@
+# Multi-stage build for Go LLM Gateway
+# Stage 1: Build the Go binary
+FROM golang:alpine AS builder
+
+# Install build dependencies
+RUN apk add --no-cache git ca-certificates tzdata
+
+WORKDIR /build
+
+# Copy go mod files first for better caching
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build the binary with optimizations
+# CGO is required for SQLite support
+RUN apk add --no-cache gcc musl-dev && \
+    CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build \
+    -ldflags='-w -s -extldflags "-static"' \
+    -a -installsuffix cgo \
+    -o gateway \
+    ./cmd/gateway
+
+# Stage 2: Create minimal runtime image
+FROM alpine:3.19
+
+# Install runtime dependencies
+RUN apk add --no-cache ca-certificates tzdata
+
+# Create non-root user
+RUN addgroup -g 1000 gateway && \
+    adduser -D -u 1000 -G gateway gateway
+
+# Create necessary directories
+RUN mkdir -p /app /app/data && \
+    chown -R gateway:gateway /app
+
+WORKDIR /app
+
+# Copy binary from builder
+COPY --from=builder /build/gateway /app/gateway
+
+# Copy example config (optional, mainly for documentation)
+COPY config.example.yaml /app/config.example.yaml
+
+# Switch to non-root user
+USER gateway
+
+# Expose port
+EXPOSE 8080
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1
+
+# Set entrypoint
+ENTRYPOINT ["/app/gateway"]
+
+# Default command (can be overridden)
+CMD ["--config", "/app/config/config.yaml"]