add workflow

.github/workflows/publish.yml

@@ -0,0 +1,24 @@
+name: Publish Images
+on:
+  release:
+    types: [published, created, edited, released, prereleased]
+
+jobs:
+  publish:
+    name: Build and Publish Images
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: git fetch --prune --unshallow
+      - name: Get release version
+        id: get_version
+        run: echo ::set-env name=RELEASE_VERSION::$(git describe --tags --abbrev=0)
+      - name: Build and Publish
+        uses: elgohr/Publish-Docker-Github-Action@master
+        with:
+          name: sgryczan/trident-installer
+          username: ${{ secrets.DOCKER_HUB_USER }}
+          password: ${{ secrets.DOCKER_HUB_PASSWORD }}
+          registry: docker.io
+          dockerfile: build/Dockerfile
+          tags: "latest,${{ env.RELEASE_VERSION }}"