Initial Keila Cloudron package

Dockerfile

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+FROM cloudron/base:4.2.0
+
+# Install dependencies
+RUN mkdir -p /app/code /app/data
+WORKDIR /app/code
+
+# Install Elixir and dependencies
+RUN curl -fSL https://github.com/elixir-lang/elixir/releases/download/v1.15.7/elixir-otp-26.zip -o elixir.zip \
+    && unzip elixir.zip -d /opt/elixir \
+    && rm elixir.zip \
+    && ln -s /opt/elixir/bin/* /usr/local/bin/ \
+    && apt-get update \
+    && apt-get install -y git build-essential cmake nodejs npm postgresql-client \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set environment variables
+ENV MIX_ENV=prod
+ENV PATH="/opt/elixir/bin:$PATH"
+
+# Clone and build Keila
+RUN git clone --depth 1 --branch v0.14.7 https://github.com/pentacent/keila.git . \
+    && mix local.hex --force \
+    && mix local.rebar --force \
+    && mix deps.get --only prod \
+    && mix deps.compile \
+    && cd assets && npm ci && npm run deploy && cd .. \
+    && mix phx.digest \
+    && mix release
+
+# Copy initialization data
+RUN cp -r _build/prod/rel/keila /tmp/keila-release
+
+# Copy start script
+COPY start.sh /app/code/start.sh
+COPY nginx.conf /etc/nginx/sites-available/default
+
+# Set permissions
+RUN chmod +x /app/code/start.sh \
+    && chown -R cloudron:cloudron /app/code /app/data /tmp/keila-release
+
+EXPOSE 4000
+
+CMD ["/app/code/start.sh"]