diff --git a/.drone.yml b/.drone.yml
index 1dd8084..cfa3955 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -3,7 +3,17 @@ type: docker
 name: default
 
 steps:
-- name: test
-  image: 1.81-bookworm
+
+- name: build (rust)
+  image: rust:1.81-bookworm
   commands:
   - cargo test --verbose --all
+  - curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+  - (cd um_wasm && wasm-pack build --release --target web --out-dir ../um_wasm_loader/pkg)
+
+- name: build (node)
+  image: node:22.9-bookworm
+  commands:
+  - corepack enable
+  - pnpm i
+  - BUILD_SKIP_WASM_PACK=1 pnpm build
diff --git a/Dockerfile b/Dockerfile
index 6f14faa..9606bc3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,3 +15,4 @@ RUN git config --global --add safe.directory /a
 ENV PATH="/h/.local/share/pnpm:$PATH"
 
 WORKDIR /a
+CMD ["/usr/bin/sleep", "infinity"]
diff --git a/build.sh b/build.sh
old mode 100644
new mode 100755
index 463d8d8..0b23d7a
--- a/build.sh
+++ b/build.sh
@@ -5,7 +5,18 @@ docker volume create umc_rust_pnpm_cache
 docker volume create umc_rust_target_cache
 docker volume create umc_pnpm_loader_cache
 docker buildx build --build-arg uid="$(id -u)" --build-arg gid="$(id -g)" -t umc_rust .
-umc_rust_id="$(docker run -d -v umc_rust_cache:/h/.cargo -v "${PWD}:/a" -v umc_rust_pnpm_cache:/a/.pnpm-store -v umc_rust_target_cache:/a/target -v umc_pnpm_loader_cache:/a/um_wasm_loader/node_modules --entrypoint /usr/bin/sleep umc_rust infinity)"
+
+run_container() {
+    docker run -d \
+        -v umc_rust_cache:/h/.cargo \
+        -v "${PWD}:/a" \
+        -v umc_rust_pnpm_cache:/a/.pnpm-store \
+        -v umc_rust_target_cache:/a/target \
+        -v umc_pnpm_loader_cache:/a/um_wasm_loader/node_modules \
+        umc_rust
+}
+
+umc_rust_id="$(run_container)"
 
 docker exec -i -u root "${umc_rust_id}" chown "$(id -u):$(id -g)" \
     /h/.cargo \
@@ -22,4 +33,3 @@ docker exec -i "${umc_rust_id}" bash <<'EOF'
 EOF
 docker stop "${umc_rust_id}"
 docker rm -f "${umc_rust_id}"
-
diff --git a/um_wasm_loader/build.js b/um_wasm_loader/build.js
index 605c6d1..90c0a12 100644
--- a/um_wasm_loader/build.js
+++ b/um_wasm_loader/build.js
@@ -77,12 +77,15 @@ async function main() {
   const wasmSourceDir = path.join(__dirname, '..', 'um_wasm');
   const wasmOutDir = path.resolve(__dirname, 'pkg');
   const wasmDistDir = path.resolve(__dirname, 'dist');
-  await rm(wasmOutDir, { recursive: true, force: true });
   const wasmRelOutDir = path.relative(wasmSourceDir, wasmOutDir);
   const profileFlag = parseBoolean(process.env.BUILD_RELEASE, true) ? '--release' : '--dev';
-  await run(['wasm-pack', 'build', profileFlag, '--target', 'web', '--out-dir', wasmRelOutDir], {
-    cwd: path.resolve(__dirname, '..', 'um_wasm'),
-  });
+
+  if (process.env.BUILD_SKIP_WASM_PACK !== '1') {
+    await rm(wasmOutDir, { recursive: true, force: true });
+    await run(['wasm-pack', 'build', profileFlag, '--target', 'web', '--out-dir', wasmRelOutDir], {
+      cwd: path.resolve(__dirname, '..', 'um_wasm'),
+    });
+  }
 
   // Remove unneeded files
   await Promise.all([
@@ -93,7 +96,7 @@ async function main() {
   ]);
 
   const homeDir = os.homedir();
-  const dummyHome = '/h' + homeDir.slice(3).replace(/./g, '_') + '/';
+  const dummyHome = '/h' + homeDir.slice(2).replace(/./g, '_');
 
   // Patch some files...
   await Promise.all([