replace travis with github actions

.github/workflows/dockerimage-latest.yml

@@ -0,0 +1,17 @@
+name: Docker Image latest
+
+on:
+  push:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build the Docker image
+        run: docker build . --file Dockerfile --tag markusressel/py-image-dedup:latest
+      - name: Login to DockerHub Registry
+        run: echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u ${{ secrets.DOCKERHUB_USERNAME }} --password-stdin
+      - name: Push the Docker image
+        run: docker push markusressel/py-image-dedup:latest

.github/workflows/dockerimage-release.yml

@@ -0,0 +1,21 @@
+name: Docker Image Release
+
+on:
+  push:
+    tags:
+      - "*.*.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      # this writes the tag name into GIT_TAG_NAME
+      - name: Get tag name
+        uses: olegtarasov/get-tag@v2
+      - name: Build the Docker image
+        run: docker build . --file Dockerfile --tag markusressel/py-image-dedup:$GIT_TAG_NAME
+      - name: Login to DockerHub Registry
+        run: echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u ${{ secrets.DOCKERHUB_USERNAME }} --password-stdin
+      - name: Push the Docker image
+        run: docker push markusressel/py-image-dedup:$GIT_TAG_NAME