diff --git a/.github/workflows/test-only.yml b/.github/workflows/test-only.yml
new file mode 100644
index 00000000..eb1a1805
--- /dev/null
+++ b/.github/workflows/test-only.yml
@@ -0,0 +1,35 @@
+name: Test only
+
+on:
+  push:
+    branches:
+      - /refs/heads/*
+      - !master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install flake8 pytest
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+
+      - name: Lint with flake8
+        run: |
+          # stop the build if there are Python syntax errors or undefined names
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+      - name: Test with pytest
+        run: |
+          cd backend; pytest
+
diff --git a/Dockerfile b/Dockerfile
index 0a1e40fa..c42fde41 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,5 @@
 FROM python:3.8-slim
 COPY requirements.txt /tmp/requirements.txt
-RUN apt-get update && apt-get install -y gcc libc-dev libxslt-dev zlib1g-dev g++
 
 RUN pip3 install -r /tmp/requirements.txt