added docs and container (podman + docker) setup

assets/Containerfile.alpine

@@ -0,0 +1,41 @@
+# Alpine-based with shell for debugging
+# SELinux compatible, rootless ready
+
+FROM docker.io/library/golang:1.23-alpine AS builder
+
+RUN apk add --no-cache git ca-certificates
+
+WORKDIR /build
+
+COPY go.mod go.sum* ./
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 go build \
+  -ldflags='-w -s' \
+  -o argparse-builder \
+  .
+
+FROM docker.io/library/alpine:3.19
+
+LABEL maintainer="your-email@example.com" \
+  org.opencontainers.image.title="Argparse Builder (Alpine)" \
+  org.opencontainers.image.description="Interactive bash argument parser generator" \
+  org.opencontainers.image.version="1.0.0"
+
+RUN apk add --no-cache ca-certificates tzdata && \
+  adduser -D -u 1000 -h /app argparse
+
+WORKDIR /app
+
+COPY --from=builder --chown=argparse:argparse /build/argparse-builder .
+
+USER argparse
+
+EXPOSE 8080
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1
+
+ENTRYPOINT ["/app/argparse-builder"]