Adding a docker CI

.github/workflows/docker.yml

@@ -0,0 +1,22 @@
+name: Docker
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
+    steps:
+      - uses: actions/checkout@v2
+      - name: Checkout submodules
+        run: git submodule update --init --recursive
+      - name: Push to GitHub Packages
+        uses: docker/build-push-action@v2
+        with:
+          username: ${{github.actor}}
+          password: ${{secrets.GITHUB_TOKEN}}
+          registry: docker.pkg.github.com
+          repository: AnonymusRaccoon/Kyoo/kyoo
+          tag_with_sha: true
+      - name: Docker build
+        run: docker build . -t kyoo:$(date +%s)