Set up CI to Docker Hub using GitHub Actions

Author: tuukka

.github/workflows/ci.yaml

@@ -0,0 +1,40 @@
+---
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          install: true
+      -
+        name: Login to DockerHub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Determine metadata for DockerHub
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: ${{ secrets.DOCKERHUB_USERNAME }}/wikidocumentaries-api
+          flavor: |
+            latest=${{ github.ref == 'refs/heads/master' }}
+      -
+        name: Build and push to DockerHub
+        uses: docker/build-push-action@v2
+        with:
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}