github action added

.github/workflows/push.yml

@@ -0,0 +1,40 @@
+name: docker-based-ci
+on: push
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set ENV variables
+        run: |
+          echo "REGISTRY=ghcr.io" >> $GITHUB_ENV
+          echo "REPO_OWNER=$(echo ${GITHUB_REPOSITORY%/*})" >> $GITHUB_ENV
+          echo "REPO_NAME=$(echo ${GITHUB_REPOSITORY#*/})" >> $GITHUB_ENV
+          echo "BRANCH_NAME=$(echo ${GITHUB_REF#refs/heads/} | tr / -)" >> $GITHUB_ENV
+          echo "DOCKER_TAG=$(echo ${GITHUB_REPOSITORY#*/}):$(echo ${GITHUB_REF#refs/heads/} | tr / -)" >> $GITHUB_ENV
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{runner.os}}-buildx-${{github.sha}}
+          restore-keys: ${{runner.os}}-buildx-
+      - name: Login to GitHub Container Registry
+        uses: docker/#-action@v1
+        with:
+          registry: ${{env.REGISTRY}}
+          username: ${{env.REPO_OWNER}}
+          password: ${{secrets.CR_PAT}}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{env.REGISTRY}}/${{env.REPO_OWNER}}/${{env.DOCKER_TAG}}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
+      - name: Execute tests
+        run: docker run -t --entrypoint="mix" ${REGISTRY}/${REPO_OWNER}/${DOCKER_TAG} test --seed 0 --trace

Dockerfile

@@ -1,4 +1,4 @@
-FROM "elixir:1.10.1-slim"
+FROM "elixir:1.10.4-slim"
 
 ARG MIX_ENV=dev
 ENV MIX_ENV=$MIX_ENV