diff --git a/.github/utils/get_core_repo.py b/.github/utils/get_core_repo.py
index 9c7bea8b..d9a09002 100644
--- a/.github/utils/get_core_repo.py
+++ b/.github/utils/get_core_repo.py
@@ -90,9 +90,11 @@ def main():
         print(f'Uncommon branch {branch}; defaulting to master')
         branch = 'master'
 
-    with open(os.environ['GITHUB_ENV'], 'a') as f:
-        f.write(f'{SCOPE}_REPO={full_repo}\n')
-        f.write(f'{SCOPE}_BRANCH={branch}\n')
+    for fn in (os.environ['GITHUB_ENV'], os.environ['GITHUB_OUTPUT']):
+        with open(fn, 'a') as f:
+            f.write(f'{SCOPE}_REPO={full_repo}\n')
+            f.write(f'{SCOPE}_BRANCH={branch}\n')
+
     return 0
 
 
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 00000000..91555262
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,101 @@
+name: Build
+
+env:
+  PYTHON_VERSION: '3.12'
+  TZ: Europe/Zurich
+
+on:
+  push:
+    branches:
+      - 'master'
+      - '*.x'
+      - 'ci-build-plugins'  # TODO remove
+  pull_request:
+      branches:
+        - 'master'
+        - '*.x'
+      types:
+        - opened
+        - reopened
+        - synchronize
+        - labeled
+
+jobs:
+  build:
+    name: Build plugin packages 📦
+    runs-on: ubuntu-22.04
+    if: github.event_name == 'push' || contains(github.event.pull_request.labels.*.name, 'build-wheel')
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          path: plugins
+          # prefer head commit over merge commit in case of PRs
+          ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || '' }}
+
+      - name: Pick Indico core repo
+        id: core-repo
+        env:
+          GH_TOKEN: ${{ github.token }}
+          PR_BODY: ${{ github.event_name == 'pull_request' && github.event.pull_request.body }}
+          PR_BASE_REF: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.ref }}
+        run: python plugins/.github/utils/get_core_repo.py indico/indico INDICO
+
+      - name: Checkout Indico core code
+        uses: actions/checkout@v4
+        with:
+          path: indico
+          repository: indico/indico
+          ref: ${{ steps.core-repo.outputs.INDICO_BRANCH }}
+
+      - name: Set up Python 🐍
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          cache: pip
+          cache-dependency-path: |
+            indico/requirements*.txt
+            plugins/**/setup.cfg
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18.x
+
+      - name: Get pip cache dir
+        id: pip-cache
+        run: echo "dir=$(pip cache dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache pip
+        id: cache-pip
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.pip-cache.outputs.dir }}
+          key: pip|${{ runner.os }}|${{ env.PYTHON_VERSION }}|${{ hashFiles('indico/requirements*.txt') }}|${{ hashFiles('plugins/**/setup.cfg') }}
+
+      - name: Test
+        run: |
+          ls -al
+          echo
+          ls -al plugins
+          echo
+          ls -al indico
+          echo
+
+      # - name: Install build deps 🔧
+      #   run: |
+      #     sudo apt-get install libpq-dev
+      #     pip install --user -U pip setuptools wheel
+      #     pip install --user -e '.[dev]'
+
+      # - name: Install npm deps ☕
+      #   run: npm ci
+
+      # - name: Build wheel 🏗
+      #   run: ./bin/maintenance/build-wheel.py indico --add-version-suffix
+
+      # - uses: actions/upload-artifact@v4
+      #   name: Upload build artifacts 📦
+      #   with:
+      #     name: indico-wheel
+      #     retention-days: 7
+      #     path: ./dist