[#224] Enable CORS for localhost

This is a pre-step before implementing an exception that will be applied
only to dev environment. This update facilitates easier development and
testing by allowing local frontend applications to communicate with the
backend without CORS restrictions.

For development purposes, Cross-Origin Resource Sharing (CORS) settings
have been updated to include `localhost` in the list of allowed origins.
In next step the configuration for different environments will be stated
explicite in target docjer-compose file.

scripts/govtool/docker-compose.sanchonet.yml

@@ -182,8 +182,10 @@ services:
       - "traefik.enable=true"
       - "traefik.http.routers.backend.rule=Host(`${DOMAIN:-$ENVIRONMENT-$CARDANO_NETWORK.govtool.byron.network}`) && PathPrefix(`/api`)"
       - "traefik.http.middlewares.backend-stripprefix.stripprefix.prefixes=/api"
-      - "traefik.http.middlewares.backend-cors.headers.customresponseheaders.Access-Control-Allow-Origin=https://${DOMAIN:-$ENVIRONMENT-$CARDANO_NETWORK.govtool.byron.network}"
-      - "traefik.http.middlewares.backend-cors.headers.customresponseheaders.Access-Control-Allow-Methods=GET,HEAD,OPTIONS"
+      - "traefik.http.middlewares.backend-cors.headers.accesscontrolallowmethods=GET,HEAD,OPTIONS"
+      - "traefik.http.middlewares.backend-cors.headers.accesscontrolallowheaders=*"
+      - "traefik.http.middlewares.backend-cors.headers.accesscontrolalloworiginlist=https://${DOMAIN:-$ENVIRONMENT-$CARDANO_NETWORK.govtool.byron.network},http://localhost"
+      - "traefik.http.middlewares.backend-cors.headers.accesscontrolmaxage=100"
       - "traefik.http.middlewares.backend-cors.headers.addvaryheader=true"
       - "traefik.http.routers.backend.middlewares=backend-stripprefix@docker,backend-cors@docker"
       - "traefik.http.routers.backend.entrypoints=websecure"