diff --git a/.drone.yml b/.drone.yml
index cb444be..72763ef 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -4,34 +4,27 @@ type: docker
 name: default
 
 steps:
+  - name: build-wasm
+    image: emscripten/emsdk:3.0.0
+    commands:
+      - ./scripts/build-wasm.sh
+
   - name: build
     image: node:16.18-bullseye
     commands:
       - apt-get update
-      - apt-get install -y cmake jq zip
-      - ./scripts/build-wasm.sh
+      - apt-get install -y jq zip
       - npm ci
       - npm run test
       - ./scripts/build-and-package.sh legacy
       - ./scripts/build-and-package.sh extension
       - ./scripts/build-and-package.sh modern
-      - sha256sum *.zip > sha256sum.txt
-      - mkdir -p upload
-      - mv *.zip sha256sum.txt upload/
 
-  - name: upload
-    image: "plugins/s3"
-    settings:
-      path_style: true
-      endpoint:
-        from_secret: S3_ENDPOINT
-      access_key:
-        from_secret: S3_ACCESS_KEY
-      secret_key:
-        from_secret: S3_SECRET_KEY
-      bucket:
-        from_secret: S3_BUCKET
-      region: "auto"
-      source: "upload/*"
-      strip_prefix: "upload/"
-      target: "${DRONE_REPO}/${DRONE_BUILD_NUMBER}/"
+  - name: upload artifact
+    image: node:16.18-bullseye
+    environment:
+      DRONE_GITEA_SERVER: https://git.unlock-music.dev
+      GITEA_API_KEY:
+        from_secret: GITEA_API_KEY
+    commands:
+      - ./scripts/upload-packages.sh
diff --git a/scripts/upload-packages.sh b/scripts/upload-packages.sh
new file mode 100755
index 0000000..06c3d43
--- /dev/null
+++ b/scripts/upload-packages.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+set -ex
+
+cd "$(git rev-parse --show-toplevel)"
+
+if [ -z "$GITEA_API_KEY" ]; then
+  echo "GITEA_API_KEY is empty, skip upload."
+  exit 0
+fi
+
+URL_BASE="$DRONE_GITEA_SERVER/api/packages/${DRONE_REPO_NAMESPACE}/generic/${DRONE_REPO_NAME}-build"
+
+for ZIP_NAME in *.zip; do
+  UPLOAD_URL="${URL_BASE}/${DRONE_BUILD_NUMBER}/${ZIP_NAME}"
+  sha256sum "${ZIP_NAME}"
+  curl -sLifu "um-release-bot:$GITEA_API_KEY" -T "${ZIP_NAME}" "${UPLOAD_URL}"
+  echo "Uploaded to: ${UPLOAD_URL}"
+done
diff --git a/src/KgmWasm/build-wasm b/src/KgmWasm/build-wasm
index 85f5658..599b97c 100755
--- a/src/KgmWasm/build-wasm
+++ b/src/KgmWasm/build-wasm
@@ -8,29 +8,31 @@ CURR_DIR="${PWD}"
 
 BUILD_TYPE="$1"
 if [ -z "$BUILD_TYPE" ]; then
-	BUILD_TYPE=Release
+  BUILD_TYPE=Release
+fi
+
+# CI: already had emsdk installed.
+if ! command -v emcc; then
+  if [ ! -d ../../build/emsdk ]; then
+    git clone https://github.com/emscripten-core/emsdk.git ../../build/emsdk
+  fi
+
+  pushd ../../build/emsdk
+  ./emsdk install 3.0.0
+  ./emsdk activate 3.0.0
+  source ./emsdk_env.sh
+  popd # ../../build/emsdk
 fi
 
 mkdir -p build/wasm
-if [ ! -d ../../build/emsdk ]; then
-	git clone https://github.com/emscripten-core/emsdk.git ../../build/emsdk
-fi
-
-pushd ../../build/emsdk
-#git pull
-./emsdk install 3.0.0
-./emsdk activate 3.0.0
-source ./emsdk_env.sh
-popd # ../../build/emsdk
-
 pushd build/wasm
 emcmake cmake -DCMAKE_BUILD_TYPE="$BUILD_TYPE" ../..
 make -j
 TARGET_FILES="
-	KgmLegacy.js
-	KgmWasm.js
-	KgmWasm.wasm
-	KgmWasmBundle.js
+    KgmLegacy.js
+    KgmWasm.js
+    KgmWasm.wasm
+    KgmWasmBundle.js
 "
 
 cp $TARGET_FILES "${CURR_DIR}/"
diff --git a/src/QmcWasm/build-wasm b/src/QmcWasm/build-wasm
index c906fae..4cd1640 100755
--- a/src/QmcWasm/build-wasm
+++ b/src/QmcWasm/build-wasm
@@ -8,28 +8,31 @@ CURR_DIR="${PWD}"
 
 BUILD_TYPE="$1"
 if [ -z "$BUILD_TYPE" ]; then
-	BUILD_TYPE=Release
+  BUILD_TYPE=Release
+fi
+
+# CI: already had emsdk installed.
+if ! command -v emcc; then
+  if [ ! -d ../../build/emsdk ]; then
+    git clone https://github.com/emscripten-core/emsdk.git ../../build/emsdk
+  fi
+
+  pushd ../../build/emsdk
+  ./emsdk install 3.0.0
+  ./emsdk activate 3.0.0
+  source ./emsdk_env.sh
+  popd # ../../build/emsdk
 fi
 
 mkdir -p build/wasm
-if [ ! -d ../../build/emsdk ]; then
-	git clone https://github.com/emscripten-core/emsdk.git ../../build/emsdk
-fi
-
-pushd ../../build/emsdk
-./emsdk install 3.0.0
-./emsdk activate 3.0.0
-source ./emsdk_env.sh
-popd # ../../build/emsdk
-
 pushd build/wasm
 emcmake cmake -DCMAKE_BUILD_TYPE="$BUILD_TYPE" ../..
 make -j
 TARGET_FILES="
-	QmcLegacy.js
-	QmcWasm.js
-	QmcWasm.wasm
-	QmcWasmBundle.js
+  QmcLegacy.js
+  QmcWasm.js
+  QmcWasm.wasm
+  QmcWasmBundle.js
 "
 
 cp $TARGET_FILES "${CURR_DIR}/"