test(integration): run archduino install end-to-end on archlinux:base

test/integration/Dockerfile

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+# Minimal Arch image with Go toolchain for building and running archduino.
+FROM archlinux:base
+
+RUN pacman -Sy --noconfirm --needed go git ca-certificates
+
+WORKDIR /src
+COPY . /src
+
+RUN go build -o /usr/local/bin/archduino ./cmd/archduino
+
+# Run as non-root to exercise user-home paths.
+RUN useradd -m tester
+USER tester
+WORKDIR /home/tester
+
+ENTRYPOINT ["archduino"]