add workflow to publish devcontainer to docker hub

Author: glennvl

.github/workflows/ publish-devcontainer.yaml

@@ -0,0 +1,24 @@
+name: Publish devcontainer on docker hub
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+jobs:
+  publish-devcontainer:
+    name: Publish devcontainer
+    runs-on: ubuntu-latest
+    steps:
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_ACCESS_TOKEN }}
+      - name: Install docker buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          file: ./.devcontainer/Dockerfile
+          push: true
+          tags: dhglennvl/cpp-devcontainer:latest