Fixed envsubst code

.github/workflows/update_primary_nginx.yml

@@ -1,4 +1,4 @@
-name: UNFINISHED - setup nginx from the configuration file
+name: Setup nginx from the configuration file
 
 on:
   workflow_dispatch:
@@ -23,6 +23,11 @@ jobs:
       #- name: Create temporary nginx config file
       #  run: envsubst  < ./nginx_template.txt > temp_default.conf
       # Maybe look at https://www.baeldung.com/linux/envsubst-command to get an idea
+
+      # Fixed envsubst code
+      - name: Create temporary nginx config file
+        run: envsubst "$(printf '${%s} ' $(env | cut -d= -f1))" < ./nginx_template.txt > temp_default.conf
+
 
       - name: Copy temporary file to correct place 
         run: cp temp_default.conf /etc/nginx/conf.d/default.conf