ci: publish gpud images for tags

Author: gyuho

.github/workflows/docker.yaml

@@ -0,0 +1,32 @@
+name: Docker image release
+
+"on":
+  push:
+    tags:
+      - "*"
+
+permissions:
+  contents: read
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to NGC
+        uses: docker/login-action@v3
+        with:
+          registry: nvcr.io
+          username: $oauthtoken
+          password: ${{ secrets.NVAPI_KEY }}
+
+      - name: Build and push image
+        shell: bash
+        run: |
+          ./scripts/build-docker.sh \
+            --tag "nvcr.io/nvstaging/lepton/gpud:${GITHUB_REF_NAME#v}" \
+            --push