fix(config): allow colon to be in the config key

Signed-off-by: Hellgren Heikki <heikki.hellgren@op.fi>

packages/config-loader/src/sources/EnvConfigSource.ts

@@ -85,7 +85,7 @@ export class EnvConfigSource implements ConfigSource {
 const ENV_PREFIX = 'APP_CONFIG_';
 
 // Update the same pattern in config package if this is changed
-const CONFIG_KEY_PART_PATTERN = /^[a-z][a-z0-9]*(?:[-_][a-z0-9]+)*$/i;
+const CONFIG_KEY_PART_PATTERN = /^[a-z][a-z0-9]*(?:[-_:][a-z0-9]+)*$/i;
 
 /**
  * Read runtime configuration from the environment.