Add CI/CD pipeline and Docker setup for Flutter web application

.drone.yml

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+################################################################################
+# development
+################################################################################
+
+kind: pipeline
+type: docker
+name: (dev) build flutter web and push to artifactory
+
+steps:
+  - name: tag tender-pwa image
+    image: alpine/git:2.40.1
+    commands:
+      - APP_VERSION=pwa-$(git rev-list HEAD --count --no-merges)
+      - echo "Flutter PWA Version tags $APP_VERSION"
+      - echo -n "$APP_VERSION" > .tags
+  - name: tender pwa push to artifactory
+    image: plugins/docker
+    settings:
+      dockerfile: "Dockerfile"
+      username: "cicd"
+      password:
+        from_secret: "REGISTRY_PASSWORD"
+      repo: "artifactory.ravanertebat.ir/citizenclub/tm_app"
+      registry: "artifactory.ravanertebat.ir"
+      build_args:
+        - FLUTTER_VERSION=3.29.3
+        - NGINX=1.25.2-alpine3.18-slim
+
+node:
+  tag: aecde-docker-runner
+
+trigger:
+  branch:
+    - dev
+  event:
+    - custom

Dockerfile

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+ARG FLUTTER_VERSION=3.29.3
+ARG NGINX=1.25.2-alpine3.18-slim
+
+# Stage 1 - Build Flutter Web on Debian
+FROM debian:latest AS builder
+
+# Install system dependencies
+RUN apt-get update && \
+    apt-get install -y \
+    git \
+    curl \
+    unzip \
+    xz-utils \
+    libglu1-mesa \
+    cmake \
+    clang \
+    ninja-build \
+    pkg-config \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Flutter manually
+RUN git clone https://github.com/flutter/flutter.git /usr/local/flutter
+WORKDIR /usr/local/flutter
+RUN git checkout stable
+
+# Set Flutter environment
+ENV PATH="$PATH:/usr/local/flutter/bin:/usr/local/flutter/bin/cache/dart-sdk/bin"
+RUN flutter doctor -v
+RUN flutter config --enable-web
+
+# Copy app files
+COPY . /app
+WORKDIR /app
+
+# Clean and get packages
+RUN flutter clean
+RUN flutter pub get
+RUN flutter build web --release --output=build/tender-pwa
+
+# Stage 2 - Runtime with NGINX
+FROM nginx:${NGINX}
+
+# Install runtime dependencies
+RUN apk --no-cache add \
+    curl \
+    tzdata \
+    ca-certificates \
+    && mkdir -p /var/log/app \
+    && chown nginx:nginx /var/log/app
+
+# Copy build files from Debian builder
+COPY --from=builder /app/build/tender-pwa /usr/tm/nginx/html
+
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

configs/nginx.conf

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+server {
+    listen 80;
+    server_name localhost;
+    
+    root /usr/tm/nginx/html;
+    
+    location / {
+        try_files $uri $uri/ /index.html;
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+    }
+
+    location /assets {
+        expires 1y;
+        access_log off;
+        add_header Cache-Control "public";
+    }
+
+    gzip on;
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
+}