improve docker build

.github/workflows/release.yml

@@ -62,10 +62,11 @@ jobs:
           push: true
           platforms: linux/${{ matrix.arch }}
           tags: |
+
             ${{ env.IMAGE }}:${{ steps.version.outputs.version }}-slim-${{ matrix.arch }}
             ${{ env.IMAGE }}:slim-${{ matrix.arch }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          cache-from: type=gha,scope=release-slim
+          cache-to: type=gha,mode=max,scope=release-slim
 
       - name: Build and push full
         uses: docker/build-push-action@v6
@@ -77,8 +78,9 @@ jobs:
           tags: |
             ${{ env.IMAGE }}:${{ steps.version.outputs.version }}-full-${{ matrix.arch }}
             ${{ env.IMAGE }}:full-${{ matrix.arch }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          cache-from: type=gha,scope=release-full
+          cache-to: type=gha,mode=max,scope=release-full
+
 
   publish-manifests:
     runs-on: ubuntu-latest

Dockerfile

@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1.6
 # ---- Builder stage ----
 # Compiles the React frontend and the Rust binary with the frontend embedded.
 FROM rust:bookworm AS builder
@@ -21,11 +22,20 @@ WORKDIR /build
 # 1. Fetch and cache Rust dependencies.
 #    cargo fetch needs a valid target, so we create stubs that get replaced later.
 COPY Cargo.toml Cargo.lock ./
-RUN mkdir src && echo "fn main() {}" > src/main.rs && touch src/lib.rs && cargo fetch && rm -rf src
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    --mount=type=cache,target=/build/target \
+    mkdir src && echo "fn main() {}" > src/main.rs && touch src/lib.rs \
+    && cargo build --release \
+    && rm -rf src
 
 # 2. Build the frontend.
+COPY interface/package.json interface/
+RUN --mount=type=cache,target=/root/.bun/install/cache \
+    cd interface && bun install
 COPY interface/ interface/
-RUN cd interface && bun install && bun add -d @rollup/rollup-linux-x64-gnu && bun run build
+RUN --mount=type=cache,target=/root/.bun/install/cache \
+    cd interface && bun run build
 
 # 3. Copy source and compile the real binary.
 #    build.rs runs the frontend build (already done above, node_modules present).
@@ -35,7 +45,10 @@ COPY build.rs ./
 COPY prompts/ prompts/
 COPY migrations/ migrations/
 COPY src/ src/
-RUN cargo build --release
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    --mount=type=cache,target=/build/target \
+    SPACEBOT_SKIP_FRONTEND_BUILD=1 cargo build --release
 
 # ---- Slim stage ----
 # Minimal runtime with just the binary. No browser.

build.rs

@@ -1,6 +1,9 @@
 use std::process::Command;
 
 fn main() {
+    if std::env::var("SPACEBOT_SKIP_FRONTEND_BUILD").is_ok() {
+        return;
+    }
     // Re-run if interface source files change
     println!("cargo:rerun-if-changed=interface/src/");
     println!("cargo:rerun-if-changed=interface/index.html");