Add Dockerfile and .dockerignore for containerization

.dockerignore

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+.git
+.vscode
+.env
+cache.txt
+logs.txt
+Untitled-1.txt
+*.p12
+*.json
+*.exe
+# Go build cache and modules
+/tmp
+**/tmp
+*.out
+*.test
+vendor/ 

Dockerfile

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+# syntax=docker/dockerfile:1
+
+# --- Build stage ---
+FROM golang:1.24 as builder
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -o iralex-einvoice main.go
+
+# --- Run stage ---
+FROM gcr.io/distroless/base-debian12
+WORKDIR /app
+COPY --from=builder /app/iralex-einvoice ./iralex-einvoice
+COPY --from=builder /app/.env.example ./.env.example
+# If you want to provide a default .env, uncomment the next line:
+# COPY --from=builder /app/.env ./.env
+# Copy any static files or certs if needed (uncomment and adjust as needed)
+# COPY --from=builder /app/static ./static
+# COPY --from=builder /app/certs ./certs
+
+# Expose the default port (can be overridden by env or flag)
+EXPOSE 1404
+
+# Entrypoint
+ENTRYPOINT ["/app/iralex-einvoice"]