fix: caddy environement varaible interpolation

Author: xNok

ansible/roles/docker-swarm-app-caddy/assets/Caddyfile

@@ -7,11 +7,11 @@
 	order authorize before basicauth
 
 	security {
-		oauth identity provider github {env.GITHUB_CLIENT_ID} {env.GITHUB_CLIENT_SECRET}
+		oauth identity provider github {$GITHUB_CLIENT_ID} {$GITHUB_CLIENT_SECRET}
 
 		authentication portal myportal {
 			crypto default token lifetime 3600
-			crypto key sign-verify {env.JWT_SHARED_KEY}
+			crypto key sign-verify {$JWT_SHARED_KEY}
 			cookie domain {{domain}}
 			enable identity provider github
 			ui {