Adds env variables substitution mecanism launched on container startup

Author: jycr

Dockerfile

@@ -9,5 +9,8 @@ RUN npm run build
 # Stage 2: Serve the application with Nginx
 FROM nginx:1.27 as production-stage
 COPY --from=build-stage /app/dist /usr/share/nginx/html
+COPY --from=build-stage /app/dist/assets/app-config.js /usr/share/nginx/html-template/app-config.template.js
+COPY ./docker-entrypoint.d/*.sh /docker-entrypoint.d/
+RUN chmod +x /docker-entrypoint.d/*.sh
 EXPOSE 80
 CMD ["nginx", "-g", "daemon off;"]

README.md

@@ -138,7 +138,7 @@ docker build -t copilot-metrics-viewer .
 
 ### Docker run
 ```
-docker run -p 8080:80 copilot-metrics-viewer
+docker run -p 8080:80 --env-file ./.env copilot-metrics-viewer
 ```
 The application will be accessible at http://localhost:8080
 

docker-entrypoint.d/99-config-app.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+configTemplateFile=/usr/share/nginx/html-template/app-config.template.js
+configTargetFile=/usr/share/nginx/html/assets/app-config.js
+
+envsubst <"$configTemplateFile" >"$configTargetFile"