move logic to build-charts.sh

Dockerfile

@@ -106,13 +106,7 @@ ARG KUBERNETES_VERSION=""
 ARG CACHEBUST="cachebust"
 COPY charts/ /charts/
 RUN echo ${CACHEBUST}>/dev/null
-RUN readarray charts < <(yq e -o=j -I=0 '.charts[]' charts/chart_versions.yaml ) \
-    for chart in "${charts[@]}"; do \
-        version=$(echo "$chart" | yq e '.version' -) \
-        filename=$(echo "$chart" | yq e '.filename' -) \
-        bootstrap=$(echo "$chart" | yq e '.bootstrap' -) \
-        CHART_VERSION=$version CHART_FILE=$filename CHART_BOOTSTRAP=$bootstrap /charts/build-chart.sh; \
-    done 
+RUN /charts/build-charts.sh
 
 
 RUN rm -vf /charts/*.sh /charts/*.md

charts/build-charts.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -eux -o pipefail
+
+readarray charts < <(yq e -o=j -I=0 '.charts[]' charts/chart_versions.yaml )
+for chart in "${charts[@]}"; do
+    version=$(echo "$chart" | yq e '.version' -)
+    filename=$(echo "$chart" | yq e '.filename' -)
+    bootstrap=$(echo "$chart" | yq e '.bootstrap' -)
+
+    CHART_VERSION=$version CHART_FILE=$filename CHART_BOOTSTRAP=$bootstrap /charts/build-chart.sh
+done