Add docker img CI

Signed-off-by: Daniel González Lopes <[email protected]>

.github/workflows/push.yaml

@@ -0,0 +1,32 @@
+---
+name: "push"
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    name: "Build"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check Out Repo 
+        uses: actions/checkout@v2
+
+      - name: "Setup buildx"
+        uses: docker/setup-buildx-action@v1
+
+      - name: "Login into ghcr"
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: "Build image"
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          file: Dockerfile
+          tags: ghcr.io/grafana/github-traffic:latest,ghcr.io/grafana/github-traffic:${{ github.sha }}