fix: check if nginx is running before reloading during an app deletion

The purpose of the reload is to remove nginx from being loaded. If nginx isn't running, then by definition the config is not loaded.

Closes #6832

plugins/nginx-vhosts/internal-functions

@@ -523,6 +523,57 @@ fn-nginx-vhosts-nginx-location() {
   echo "$NGINX_LOCATION"
 }
 
+fn-nginx-vhosts-nginx-is-running() {
+  declare desc="check if nginx is running"
+  local NGINX_INIT_NAME
+
+  NGINX_INIT_NAME=nginx
+  if fn-nginx-vhosts-uses-openresty; then
+    NGINX_INIT_NAME=openresty
+  fi
+
+  case "$DOKKU_DISTRO" in
+    debian | raspbian)
+      if [[ -x "$systemctl_path" ]]; then
+        if sudo "$systemctl_path" is-active --quiet "$NGINX_INIT_NAME"; then
+          return 0
+        fi
+      else
+        dokku_log_warn "Checking $NGINX_INIT_NAME status is not possible for init.d managed services"
+        return 0
+      fi
+      ;;
+
+    ubuntu)
+      # support docker-based installations
+      if [[ "$DOKKU_INIT_SYSTEM" == "sv" ]]; then
+        if sudo /usr/bin/sv status $NGINX_INIT_NAME | grep -q "^run:"; then
+          return 0
+        fi
+      elif [[ -x "$systemctl_path" ]]; then
+        if sudo "$systemctl_path" is-active --quiet "$NGINX_INIT_NAME"; then
+          return 0
+        fi
+      elif [[ -x /usr/bin/sv ]]; then
+        if sudo /usr/bin/sv status $NGINX_INIT_NAME | grep -q "^run:"; then
+          return 0
+        fi
+      else
+        dokku_log_warn "Checking $NGINX_INIT_NAME status is not possible for init.d managed services"
+        return 0
+      fi
+      ;;
+
+    arch)
+      if sudo "$systemctl_path" is-active --quiet "$NGINX_INIT_NAME"; then
+        return 0
+      fi
+      ;;
+  esac
+
+  return 1
+}
+
 fn-nginx-vhosts-nginx-init-cmd() {
   declare desc="start nginx for given distros"
   declare CMD="$1"