Initial Baron Safe app scaffold

docker/Dockerfile.flutter-ci

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+FROM ghcr.io/cirruslabs/flutter:stable
+WORKDIR /workspace/app
+CMD ["flutter", "--version"]

docker/Dockerfile.web

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+FROM nginx:1.27-alpine
+COPY nginx.conf /etc/nginx/conf.d/default.conf

docker/nginx.conf

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+server {
+  listen 8080;
+  server_name _;
+
+  root /usr/share/nginx/html;
+  index index.html;
+
+  location / {
+    try_files $uri $uri/ /index.html;
+  }
+}