added nginx config, Dockerfile and ci build with .drone.yml

.drone.yml

@@ -0,0 +1,12 @@
+kind: pipeline
+name: default
+
+steps:
+  - name: docker
+    image: plugins/docker
+    settings:
+      repo: samuelph/connectivity-check
+      username:
+        from_secret: USERNAME
+      password:
+        from_secret: PASSWORD

Dockerfile

@@ -0,0 +1,4 @@
+FROM nginx
+
+COPY nginx.conf /etc/nginx/nginx.conf
+COPY index.html /usr/share/nginx/html

nginx.conf

@@ -0,0 +1,34 @@
+worker_processes 1;
+
+events {
+    worker_connections 1024;
+}
+
+http  {
+    include mime.types;
+    default_type application/octet-stream;
+    sendfile on;
+    keepalive_timeout 65;
+
+    server {
+        listen          80;
+        server_name     _;
+        root            /usr/share/nginx/html;
+
+        access_log off;
+        error_log off;
+
+        add_header Content-Security-Policy "default-src 'none'";
+        add_header Referrer-Policy "same-origin";
+        add_header Feature-Policy "sync-xhr 'none'";
+        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload";
+        add_header X-Content-Type-Options "nosniff";
+        add_header X-Frame-Options "DENY";
+        add_header X-XSS-Protection: "1; mode=block";
+        add_header X-NetworkManager-Status "online";
+
+        location /generate204 {
+                return 204;
+        }
+    }
+}