Docker Image Builds

Dockerfile

@@ -1,5 +1,7 @@
 # Build Frontend
-FROM oven/bun:alpine AS frontend-builder
+# Frontend output is static, arch-independent assets, so build it natively on the
+# build host (no emulation) regardless of the target platform.
+FROM --platform=$BUILDPLATFORM oven/bun:alpine AS frontend-builder
 WORKDIR /app
 COPY package.json ./
 RUN bun install
@@ -7,6 +9,7 @@ COPY . .
 RUN bun run build
 
 # Build Backend
+# Built for the target platform (under QEMU emulation for non-native arches).
 FROM rust:alpine AS backend-builder
 WORKDIR /app
 RUN apk add --no-cache musl-dev openssl-dev openssl-libs-static pkgconfig git
@@ -19,10 +22,21 @@ RUN cargo build --release
 
 # Final Runtime Image
 FROM alpine:3.19
+# Provided automatically by buildx (e.g. "amd64", "arm64").
+ARG TARGETARCH
 WORKDIR /app
 RUN apk add --no-cache libgcc openssl pandoc curl sqlite
 RUN mkdir -p /data
-RUN curl -L https://github.com/Myriad-Dreamin/tinymist/releases/latest/download/tinymist-alpine-x64 -o /usr/local/bin/tinymist && chmod +x /usr/local/bin/tinymist
+# Install tinymist for the target architecture.
+RUN case "$TARGETARCH" in \
+        amd64) TINYMIST_TRIPLE="x86_64-unknown-linux-musl" ;; \
+        arm64) TINYMIST_TRIPLE="aarch64-unknown-linux-musl" ;; \
+        *) echo "Unsupported TARGETARCH: $TARGETARCH" && exit 1 ;; \
+    esac && \
+    curl -fL "https://github.com/Myriad-Dreamin/tinymist/releases/latest/download/tinymist-${TINYMIST_TRIPLE}.tar.gz" -o /tmp/tinymist.tar.gz && \
+    tar -xzf /tmp/tinymist.tar.gz -C /usr/local/bin --strip-components=1 "tinymist-${TINYMIST_TRIPLE}/tinymist" && \
+    chmod +x /usr/local/bin/tinymist && \
+    rm /tmp/tinymist.tar.gz
 COPY --from=frontend-builder /app/build /app/build
 COPY --from=backend-builder /app/server/target/release/server /app/server