use github actions.

.github/workflows/build.yml

@@ -0,0 +1,32 @@
+name: "CI for builds"
+
+on:
+  push:
+    branches: [ master ]
+
+env:
+  DOCKER_IMAGE: m1k1o/blog:latest
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    #
+    # do not run on forks
+    #
+    if: github.repository_owner == 'm1k1o'
+    steps:
+      - name: Check Out Repo
+        uses: actions/checkout@v2
+
+      - name: Login to Docker Hub
+        run: |
+          docker login --username "${DOCKER_USERNAME}" --password-stdin "${DOCKER_REGISTRY}" <<< "${DOCKER_TOKEN}"
+        env:
+          DOCKER_REGISTRY: ${{ secrets.DOCKER_REGISTRY }}
+          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+          DOCKER_TOKEN: ${{ secrets.DOCKER_TOKEN }}
+
+      - name: Build blog
+        run: |
+          docker build -t ${DOCKER_IMAGE} .
+          docker push ${DOCKER_IMAGE}