fix: install flutter ourselves

Applications/AdminApi/src/AdminApi/Dockerfile

@@ -102,7 +102,20 @@ RUN dotnet publish /p:ContinuousIntegrationBuild=true /p:UseAppHost=false --no-r
 RUN dotnet publish /p:ContinuousIntegrationBuild=true --configuration Release --output /app/publish/health "/src/Applications/HealthCheck/src/HealthCheck.csproj"
 
 #### Build Flutter Admin UI ####
-FROM ghcr.io/cirruslabs/flutter:3.27.3 AS flutter-build-env
+FROM ghcr.io/cirruslabs/android-sdk:34
+
+USER root
+
+ENV FLUTTER_HOME=${HOME}/sdks/flutter
+ENV FLUTTER_VERSION=3.29.0
+ENV FLUTTER_ROOT=$FLUTTER_HOME
+ENV PATH ${PATH}:${FLUTTER_HOME}/bin:${FLUTTER_HOME}/bin/cache/dart-sdk/bin
+
+RUN git clone --depth 1 --branch ${FLUTTER_VERSION} https://github.com/flutter/flutter.git ${FLUTTER_HOME}
+
+RUN yes | flutter doctor --android-licenses \
+    && flutter doctor \
+    && chown -R root:root ${FLUTTER_HOME}
 
 COPY Applications/AdminUi /src
 WORKDIR /src