Merge pull request #5424 from truenas/update-master-docker

Add workflow to build master

.github/workflows/docker_latest.yml

+name: 'Latest Docker Image - master'
+
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: ixsystems/truenas-webui:latest
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}