Update github workflow

.github/workflows/docker-publish.yml

@@ -0,0 +1,51 @@
+name: Docker
+
+on:
+  push:
+    # Publish `master` as Docker `latest` image.
+    branches:
+      - master
+
+    # Publish `v1.2.3` tags as releases.
+    tags:
+      - '*'
+
+  # Run tests for any PRs.
+  pull_request:
+
+jobs:
+  # Run tests.
+  # See also https://docs.docker.com/docker-hub/builds/automated-testing/
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Run tests
+        run: |
+          if [ -f docker-compose.test.yml ]; then
+            docker-compose --file docker-compose.test.yml build
+            docker-compose --file docker-compose.test.yml run sut
+          else
+            docker build . --file Dockerfile
+          fi
+
+  # Push image to GitHub Packages.
+  # See also https://docs.docker.com/docker-hub/builds/
+  push:
+    # Ensure test job passes before pushing image.
+    needs: test
+
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: docker/build-push-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: snegov/seafile-client
+          tag_with_ref: true

Dockerfile

@@ -1,6 +1,6 @@
 FROM python:3-slim
 
-RUN apt-get update && apt-get install gnupg -y
+RUN apt-get update && apt-get install gnupg -y && rm -rf /var/lib/apt/lists/*
 RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 8756C4F765C9AC3CB6B85D62379CE192D401AB61 && \
     echo deb http://deb.seadrive.org buster main | tee /etc/apt/sources.list.d/seafile.list && \
     apt-get update -y && \