Use prebuilt binary instead of compiling from source

Dockerfile.cloudron

@@ -1,6 +1,6 @@
 FROM cloudron/base:5.0.0@sha256:04fd70dbd8ad6149c19de39e35718e024417c3e01dc9c6637eaf4a41ec4e596c
 
-# Install Rust for building libsignal
+# Install runtime dependencies
 RUN apt-get update && apt-get install -y \
     curl \
     ca-certificates \
@@ -8,37 +8,22 @@ RUN apt-get update && apt-get install -y \
     bash \
     jq \
     yq \
-    git \
-    build-essential \
-    libolm-dev \
     gosu \
-    cmake \
+    ffmpeg \
-    protobuf-compiler \
+    unzip \
-    clang \
-    libclang-dev \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
-# Install Rust
-RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
-ENV PATH="/root/.cargo/bin:$PATH"
-
-# Install Go
-ENV GO_VERSION=1.24.0
-RUN curl -LO https://golang.org/dl/go${GO_VERSION}.linux-amd64.tar.gz \
-    && tar -C /usr/local -xzf go${GO_VERSION}.linux-amd64.tar.gz \
-    && rm go${GO_VERSION}.linux-amd64.tar.gz
-ENV PATH="/usr/local/go/bin:$PATH"
-
 # Create app directories
 RUN mkdir -p /app/code /app/pkg /app/data
-WORKDIR /app/code
+WORKDIR /app/pkg
 
-# Download and build mautrix-signal
+# Download prebuilt mautrix-signal binary from CI
-RUN git clone --branch v0.2512.0 https://github.com/mautrix/signal.git . \
+# Using the amd64 build artifact
-    && ./build-rust.sh \
+RUN curl -L "https://mau.dev/mautrix/signal/-/jobs/artifacts/main/download?job=build%20amd64" -o /tmp/mautrix-signal.zip \
-    && LIBRARY_PATH=/app/code/pkg/libsignalgo/libsignal/target/release ./build-go.sh \
+    && unzip /tmp/mautrix-signal.zip -d /app/pkg/ \
-    && mv mautrix-signal /app/pkg/mautrix-signal
+    && chmod +x /app/pkg/mautrix-signal \
+    && rm /tmp/mautrix-signal.zip
 
 # Copy startup script
 COPY start.sh /app/pkg/