Add CI/CD workflows and Kubernetes configurations for deployment

Dockerfile

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+# Build stage
+FROM golang:1.24.4-alpine AS builder
+
+# Install build dependencies
+RUN apk add --no-cache git
+
+# Set working directory
+WORKDIR /app
+
+# Copy go mod files from src directory
+COPY src/go.mod src/go.sum ./
+
+# Download dependencies
+RUN go mod download
+
+# Copy source code from src directory
+COPY src/ .
+
+# Build the application
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o authenticator authenticator.go
+
+# Production stage
+FROM alpine:latest
+
+# Install ca-certificates for HTTPS
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /root/
+
+# Copy binary from builder
+COPY --from=builder /app/authenticator .
+
+# Copy config file
+COPY --from=builder /app/etc/authenticator.yaml ./etc/
+
+# Expose port
+EXPOSE 8888
+
+# Run the application
+CMD ["./authenticator", "-f", "etc/authenticator.yaml"]