Use Alpine to build the runtime

Smaller, works without issue.

orchestration/runtime/Dockerfile

@@ -1,14 +1,7 @@
-# rust:1.91.1-slim-trixie as of November 11th, 2025 (GMT)
-FROM --platform=linux/amd64 rust@sha256:ccdbe08a0b10498bc5f3cac3d736af7b8eb6cb0ecfc1e8a504e93d8ee76a8e8e AS deterministic
+# rust:1.91.1-alpine as of November 11th, 2025 (GMT)
+FROM --platform=linux/amd64 rust@sha256:700c0959b23445f69c82676b72caa97ca4359decd075dca55b13339df27dc4d3 AS deterministic
 
-# Move to a Debian package snapshot
-RUN rm -rf /etc/apt/sources.list.d/debian.sources && \
-  rm -rf /var/lib/apt/lists/* && \
-  echo "deb [arch=amd64] http://snapshot.debian.org/archive/debian/20251111T000000Z trixie main" > /etc/apt/sources.list && \
-  apt update
-
-# Install dependencies
-RUN apt update -y && apt upgrade -y && apt install -y clang
+RUN apk add musl-dev=1.2.5-r10
 
 # Add the wasm toolchain
 RUN rustup target add wasm32v1-none
@@ -35,6 +28,7 @@ ADD AGPL-3.0 /serai
 WORKDIR /serai
 
 # Build the runtime, copying it to the volume if it exists
+ENV RUSTFLAGS="-Ctarget-feature=-crt-static"
 CMD cargo build --release -p serai-runtime && \
   mkdir -p /volume && \
   cp /serai/target/release/wbuild/serai-runtime/serai_runtime.wasm /volume/serai.wasm

tests/reproducible-runtime/src/lib.rs

@@ -7,7 +7,7 @@ pub fn reproducibly_builds() {
   use dockertest::{PullPolicy, Image, TestBodySpecification, DockerTest};
 
   const RUNS: usize = 3;
-  const TIMEOUT: u16 = 180 * 60; // 3 hours
+  const TIMEOUT: u16 = 3 * 60 * 60; // 3 hours
 
   serai_docker_tests::build("runtime".to_string());