init

.forgejo/workflows/build.yml

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+name: build
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: host
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          registry: git.hydrar.de
+          username: ${{ secrets.registry_user }}
+          password: ${{ secrets.registry_password }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: git.hydrar.de/hydra/flutter:latest

Dockerfile

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+FROM ubuntu:22.04
+
+# Set up new user
+RUN useradd -ms /bin/bash developer
+USER developer
+WORKDIR /home/developer
+
+# Install flutter dependencies
+RUN apt-get update && apt-get install -y curl git wget unzip libgconf-2-4 gdb libstdc++6 libglu1-mesa fonts-droid-fallback lib32stdc++6 python3 xz-utils zip libglu1-mesa openjdk-8-jdk && apt-get clean
+
+# Clone the flutter repo
+RUN git clone https://github.com/flutter/flutter.git /home/developer/flutter
+ENV PATH "$PATH:/home/developer/flutter/bin"
+
+# Enable flutter web
+RUN flutter channel stable
+RUN flutter config --enable-web
+RUN flutter upgrade
+RUN flutter doctor

README.md

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+# Flutter
+Flutter Build Container