change build.sh better comments

build.sh

@@ -25,17 +25,17 @@
 # -o pipefail: Make pipelines fail if any command in the pipe fails, not just the last one
 set -euo pipefail
 
-# --- services to build (subfolder name = image suffix) ---------------------
-#SERVICES=(backend frontend)
-
 #cd to script dir
 pushd "$(dirname "${BASH_SOURCE[0]}")" > /dev/null
 SCRIPT_DIR="$(pwd)"
 source "${SCRIPT_DIR}/.env"
+# read from .env: 
+#   REGISTRY, IMAGE_NAME, IMAGE_VERSION, SNAPSHOT_TAG
+#   SERVICES (subfolder name = image suffix)
 popd > /dev/null
 
-#default: snapshot
-VERSION="${IMAGE_TAG}-${SNAPSHOT_TAG}"
+#default: build snapshot
+VERSION="${IMAGE_VERSION}-${SNAPSHOT_TAG}" # read from .env
 
 PUSH=false
 ONLY=()
@@ -64,7 +64,7 @@ if [[ ${#ONLY[@]} -gt 0 ]]; then
 fi
 
 echo "============================================"
-echo "  ${IMAGE_NAME} - Docker Build"
+echo "  Docker Build - ${IMAGE_NAME}"
 echo ""
 echo "  Services : ${SERVICES[*]}"
 echo "  Version  : ${VERSION}"
@@ -83,7 +83,7 @@ done
 
 # --- push -------------------------------------------------------------------
 if $PUSH; then
-  docker login "${REGISTRY}"
+  docker login "${REGISTRY}" # read from .env
   for SERVICE in "${SERVICES[@]}"; do
     IMAGE="${REGISTRY}/${IMAGE_NAME}-${SERVICE}:${VERSION}"
     echo ""