Fix #13, Adding Init and Micro KS files

[srbala]

• Added kickstart files for init and micro packages. This will resolve the issue #13.
• Added .gitignore to exclude work and temp output fiels.
• Adjusted build.sh to accept new types

Command to build micro package

docker run --rm --privileged -v "$PWD:/build:z" \
    -e BUILD_KICKSTART=kickstarts/almalinux-8-micro.x86_64.ks \
    -e BUILD_ROOTFS=almalinux-8-micro-docker.x86_64.tar.gz \
    -e BUILD_OUTDIR=work/micro84 \
    almalinux/ks2rootfs

Command to build init package

docker run --rm --privileged -v "$PWD:/build:z" \
    -e BUILD_KICKSTART=kickstarts/almalinux-8-init.x86_64.ks \
    -e BUILD_ROOTFS=almalinux-8-init-docker.x86_64.tar.gz \
    -e BUILD_OUTDIR=work/init84 \
    almalinux/ks2rootfs

[srbala]

Repo needs to code reorg, PR needs to be merged to clean work