add docker image build action

.github/workflows/docker.yml

@@ -0,0 +1,46 @@
+name: Publish Docker image
+
+# on:
+#   release:
+#     types: [published]
+on:
+  push:
+  pull_request:
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+
+    permissions:
+      packages: write
+      contents: read
+      attestations: write
+      id-token: write
+
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: amanukyan1385/rstudio-voltron
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@3b5e8027fcad23fda98b2e3ac259d8d67585f671
+        with:
+          context: .
+          file: ./inst/extdata/Dockerfile
+          push: true
+          # tags: ${{ steps.meta.outputs.tags }}
+          # labels: ${{ steps.meta.outputs.labels }}
+          tags: latest