Add CORS_ENABLED env var for docker-compose

CHANGES_NEXT_RELEASE

@@ -1 +1,2 @@
 - Set Nodejs 14 as minimum version in packages.json (effectively removing Nodev12 from supported versions)
+- Add: CORS_ENABLED env var (boolean) to enable the cors configuration (of config.js file) in your docker image (#608)

doc/manuals/running.md

@@ -101,6 +101,7 @@ The environment variables accepted by the script (for which there exists counter
 -   `PROOF_OF_LIFE_INTERVAL`: The time in seconds between proof of life logging messages informing that the server is up
     and running normally. Default value: "60". `PROCESSED_REQUEST_LOG_STATISTICS_INTERVAL`: The time in seconds between
     processed requests statistics appear in the logs. Default value: "60".
+-   `CORS_ENABLED`: Boolean attribute (`true`|`false`) to enable cors configuration. Optional. Default value: "false".
 
 For example, to start the STH server listening on port 7777, connecting to a MongoDB instance listening on
 mymongo.com:27777 and without filtering out the empty results, use:

lib/configuration/sthConfiguration.js

@@ -223,7 +223,10 @@ if (ENV.STH_PORT && !isNaN(ENV.STH_PORT)) {
     );
 }
 
-if (config && config.cors && config.cors.enabled) {
+if (ENV.CORS_ENABLED && !(ENV.CORS_ENABLED == null)) {
+    module.exports.corsEnabled = JSON.parse(ENV.CORS_ENABLED);
+    sthLogger.info(module.exports.LOGGING_CONTEXT.STARTUP, 'CORS value set to: ' + module.exports.corsEnabled);
+} else if (config && config.cors && config.cors.enabled) {
     module.exports.corsEnabled = JSON.parse(config.cors.enabled);
     sthLogger.info(module.exports.LOGGING_CONTEXT.STARTUP, 'CORS value set to: ' + module.exports.corsEnabled);
 } else {