Added option to define style config using environment variables for t…

…he NeoDash docker image (#876)

docs/modules/ROOT/pages/developer-guide/style-configuration.adoc

@@ -6,9 +6,15 @@ link:https://cdn.jsdelivr.net/npm/@neo4j-ndl/base@1.4.0/lib/tokens/css/tokens.cs
 
 For a simple (non-Dockerized) deployment, these configuration parameters
 can be changed by modifying `dist/style.config.json` after you have built the
-application. When Docker image, these can not be passed as environment
-variables.
+application. When using the NeoDash Docker image, these can be passed as environment
+variables. For example:
 
+....
+docker run -p 5005:5005 \
+ -e DASHBOARD_HEADER_BRAND_LOGO=https://picsum.photos/500/100 \
+ neo4jlabs/neodash
+....
+
 An example configuration for NeoDash
 
 ....

scripts/config-entrypoint.sh

@@ -27,4 +27,17 @@ echo " \
     \"customHeader\": \"${customHeader:=}\"  \
    }" > /usr/share/nginx/html/config.json
 
-echo "${styleConfigJson:={\}}" > /usr/share/nginx/html/style.config.json
+echo " \
+  { \
+  \"DASHBOARD_HEADER_BRAND_LOGO\": \"${DASHBOARD_HEADER_BRAND_LOGO:=}\",  \
+  \"DASHBOARD_HEADER_COLOR\" : \"${DASHBOARD_HEADER_COLOR:=}\",  \
+  \"DASHBOARD_HEADER_BUTTON_COLOR\" : \"${DASHBOARD_HEADER_BUTTON_COLOR:=}\",  \
+  \"DASHBOARD_HEADER_TITLE_COLOR\" : \"${DASHBOARD_HEADER_TITLE_COLOR:=}\",  \
+  \"DASHBOARD_PAGE_LIST_COLOR\" : \"${DASHBOARD_PAGE_LIST_COLOR:=}\", \
+  \"DASHBOARD_PAGE_LIST_ACTIVE_COLOR\": \"${DASHBOARD_PAGE_LIST_ACTIVE_COLOR:=}\", \
+  \"style\": { \
+    \"--palette-light-neutral-bg-weak\": \"${STYLE_PALETTE_LIGHT_NEUTRAL_BG_WEAK:=}\" \
+  } \
+}" > /usr/share/nginx/html/style.config.json
+
+