Added docker file

Signed-off-by: Bala Raman <srbala@gmail.com>

.dockerignore

@@ -0,0 +1,3 @@
+# Ignore tests tar.gz files
+.tar.gz
+.zip

Dockerfile

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+FROM almalinux:8 as builder
+
+RUN mkdir -p /mnt/system-root /mnt/system-root/build; \
+    dnf install --installroot /mnt/system-root  --releasever 8 --setopt=install_weak_deps=false --setopt=tsflags=nodocs -y coreutils-single \
+    bash \
+    glibc-minimal-langpack \
+    anaconda-tui \
+    lorax \
+    jq \
+    tar \
+    policycoreutils \
+    libblockdev-mdraid  \
+    libblockdev-crypto \
+    libblockdev-lvm \
+    libblockdev-dm \
+    libblockdev-swap \
+    libblockdev-loop \
+    libblockdev-nvdimm \
+    libblockdev-mpath \
+    rootfiles; \
+    rm -rf /mnt/system-root/var/cache/* ; \
+    dnf clean all; \
+    cp /etc/yum.repos.d/* /mnt/system-root/etc/yum.repos.d/ ; \
+    rm -rf /var/cache/yum; \
+    # generate build time file for compatibility with CentOS
+    /bin/date +%Y%m%d_%H%M > /mnt/system-root/etc/BUILDTIME ;\
+    # set DNF infra variable to container for compatibility with CentOS
+    echo 'container' > /mnt/system-root/etc/dnf/vars/infra; \
+    # install only en_US.UTF-8 locale files, see
+    # https://fedoraproject.org/wiki/Changes/Glibc_locale_subpackaging for details
+    echo '%_install_langs en_US.UTF-8' > /mnt/system-root/etc/rpm/macros.image-language-conf ;\
+    touch /mnt/system-root/etc/machine-id
+
+COPY scripts/ /mnt/system-root/usr/bin
+
+# Create Final image from scratch for ks2rootfs
+FROM scratch
+
+COPY --from=builder /mnt/system-root/ /
+
+WORKDIR /build
+
+ENTRYPOINT ["/usr/bin/ks2rootfs"]