try

omni-tools/rootfs/etc/cont-init.d/99-run.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/with-contenv bashio
+# shellcheck shell=bash
+# ==============================================================================
+# Home Assistant Add-on: Omni Tools
+# Starts omni-tools
+# ==============================================================================
+
+bashio::log.info "Starting omni-tools..."
+
+# Create nginx configuration
+mkdir -p /etc/nginx/http.d
+
+cat > /etc/nginx/http.d/default.conf << 'EOF'
+server {
+    listen 8080;
+    server_name _;
+    
+    location / {
+        proxy_pass http://localhost:80;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+}
+EOF
+
+# Start nginx
+nginx
+
+# Start omni-tools container content
+exec docker run -d --name omni-tools-app --restart unless-stopped -p 80:80 iib0011/omni-tools:latest