Create publish-esp-idf-rust-image.yml

Register GitHub Action on main branch

.github/workflows/publish-esp-idf-rust-image.yml

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+name: Publish esp-idf-rust image on DockerHub
+
+on: workflow_dispatch
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_TOKEN }}
+      - name: Push to Docker Hub
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: georgikrocks/esp-idf-rust:latest