github-action: build and deploy docker.

Build and deploy docker image daily.
This will be deployed to nnstreamer:nnstreamer docker hub repo.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>

.github/workflows/docker.yml

@@ -0,0 +1,28 @@
+name: Docker build and deploy
+
+on:
+  schedule:
+    # Daily at 1:15 am
+    - cron: '15 01 * * *'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Login to Docker Hub
+      uses: docker/login-action@v3
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+    - name: Setup Docker Buildx
+      uses: docker/setup-buildx-action@v3
+    - name: Build and push
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        file: tools/docker/Dockerfile
+        push: true
+        tags: ${{ secrets.DOCKERHUB_USERNAME }}/nnstreamer:latest