feat: add arch imag

arch/Dockerfile

@@ -0,0 +1,42 @@
+FROM alpine:3.15 AS bootstrapper
+ARG TARGETARCH
+COPY files /files
+RUN \
+	apk add arch-install-scripts pacman-makepkg curl && \
+	cat /files/repos-$TARGETARCH >> /etc/pacman.conf && \
+	mkdir -p /etc/pacman.d && \
+	cp /files/mirrorlist-$TARGETARCH /etc/pacman.d/mirrorlist && \
+    BOOTSTRAP_EXTRA_PACKAGES="" && \
+	if [[ "$TARGETARCH" == "amd64" ]]; then \
+			apk add zstd && \
+			mkdir /tmp/archlinux-keyring && \
+			curl -L https://archlinux.org/packages/core/any/archlinux-keyring/download | unzstd | tar -C /tmp/archlinux-keyring -xv && \
+			mv /tmp/archlinux-keyring/usr/share/pacman/keyrings /usr/share/pacman/; \
+	elif [[ "$TARGETARCH" == "arm64" ]]; then \
+			curl -L https://github.com/archlinuxarm/archlinuxarm-keyring/archive/refs/heads/master.zip | unzip -d /tmp/archlinuxarm-keyring - && \
+			mkdir /usr/share/pacman/keyrings && \
+			mv /tmp/archlinuxarm-keyring/*/archlinuxarm* /usr/share/pacman/keyrings/ && \
+            BOOTSTRAP_EXTRA_PACKAGES="archlinuxarm-keyring"; \
+	fi && \
+	pacman-key --init && \
+	pacman-key --populate && \
+	mkdir /rootfs && \
+	/files/pacstrap-docker /rootfs base-devel $BOOTSTRAP_EXTRA_PACKAGES && \
+	cp /etc/pacman.d/mirrorlist /rootfs/etc/pacman.d/mirrorlist && \
+	echo "en_US.UTF-8 UTF-8" > /rootfs/etc/locale.gen && \
+	echo "LANG=en_US.UTF-8" > /rootfs/etc/locale.conf && \
+	chroot /rootfs locale-gen && \
+	rm -rf /rootfs/var/lib/pacman/sync/* /rootfs/files
+
+FROM scratch
+COPY --from=bootstrapper /rootfs/ /
+ENV LANG=en_US.UTF-8
+RUN \
+	ln -sf /usr/lib/os-release /etc/os-release && \
+	pacman-key --init && \
+	pacman-key --populate && \
+	rm -rf /etc/pacman.d/gnupg/{openpgp-revocs.d/,private-keys-v1.d/,pubring.gpg~,gnupg.S.}* && \
+    # Enable LTO by default \
+    sed -i 's/!lto/lto/' /etc/makepkg.conf
+
+CMD ["/usr/bin/bash"]