Rewrite podman_build arg parsing

Use getopts to implement help text and a flag for images with no
registry

Move default image tag back to quay.io/ibutsu prefix, use new flag to
control it

podman_build.sh

@@ -1,20 +1,47 @@
 #!/bin/bash
 
-if [[ "$1" == "" ]]; then
-    IMAGES_TO_BUILD=("backend" "scheduler" "worker" "flower" "frontend")
-else
+function print_usage() {
+    echo "Usage: podman_build.sh [-h|--help] [--local-tag] [backend|scheduler|worker|flower|frontend]"
+    echo ""
+    echo "optional arguments:"
+    echo "  -h            show this help message"
+    echo "  -l            use a tag with no registry specified"
+    echo "  images*        images to build, or nothing to build all images"
+    echo ""
+}
+
+# Defaults for output
+IMAGE_PREFIX="quay.io/ibutsu/"
+IMAGES_TO_BUILD=("backend" "scheduler" "worker" "flower" "frontend")
+
+# Parse the options
+while getopts ':lh' OPTION
+do
+    case "${OPTION}" in
+      h) print_usage; exit 0;;
+      l) IMAGE_PREFIX="ibutsu/";;
+      *) print_usage; exit 1;;
+    esac
+done
+
+# Handle the image args
+shift $((OPTIND - 1))
+if [[ "$1" != "" ]]; then
     IMAGES_TO_BUILD=("$1")
 fi
 
-# Image info
+# 7 char SHA for tagging
 IMAGE_TAG=$(git rev-parse --short=7 HEAD)
-IMAGE_PREFIX="ibutsu/"
 
-declare -A RESULTS
+# Let the user know what we're going to do
+printf "\nCurrent SHA for image tags: %s\n" ${IMAGE_TAG}
+echo "Building image(s): ${IMAGES_TO_BUILD[*]}"
+
 
-# Build images
+# Iterate and build images sequentially
+declare -A RESULTS
 for IMAGE in "${IMAGES_TO_BUILD[@]}"; do
-    printf -- "\n--------------------- BUILDING: %s ---------------------\n" ${IMAGE}
+    printf -- "\n---------------- BUILDING: %s%s:%s ----------------\n" ${IMAGE_PREFIX} ${IMAGE} ${IMAGE_TAG}
     if [[ "${IMAGE}" == "frontend" ]]; then
         BASE_DIR=frontend
     else
@@ -24,6 +51,7 @@ for IMAGE in "${IMAGES_TO_BUILD[@]}"; do
     RESULTS[${IMAGE}]=$?
 done
 
+# dump results to console at the end
 echo "BUILD RESULTS:"
 for IMAGE in "${!RESULTS[@]}"; do
     printf "%s: %d\n" $IMAGE ${RESULTS[${IMAGE}]}