Create docker-image.yml (#95)

* Create docker-image.yml

* Update docker-image.yml

Author: simon-wg

.github/workflows/docker-image.yml

@@ -0,0 +1,33 @@
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+name: "CI"
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to GitHub Container Registry
+        if: ${{ github.ref == 'refs/heads/master' }}
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./Dockerfile
+          push: ${{ github.ref == 'refs/heads/master' }}
+          tags: ghcr.io/cthit/eatit:latest