Update Dockerfile to use dotnet 7.0 (#891)

* update dockerfile dotnet version to 7.0

* add github actions for a docker build test

* fix docker build context

* update step versions

.github/workflows/docker-test.yml

@@ -0,0 +1,22 @@
+name: Docker Build Test
+
+on: pull_request
+
+jobs:
+  docker-build-test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v2
+    - name: Set up Docker Buildx
+      id: buildx
+      uses: docker/setup-buildx-action@v2
+    - name: Build-Test
+      run: |
+        docker buildx build \
+          --no-cache \
+          --tag ghcr.io/neo-project/neo-node:latest \
+          --platform linux/amd64,linux/arm64 \
+          ./

Dockerfile

@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:6.0 AS Build
+FROM mcr.microsoft.com/dotnet/sdk:7.0 AS Build
 
 COPY neo-cli /neo-cli
 COPY Neo.ConsoleService /Neo.ConsoleService
@@ -7,7 +7,7 @@ COPY NuGet.Config /neo-cli
 WORKDIR /neo-cli
 RUN dotnet restore && dotnet publish -c Release -o /app
 
-FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS Final
+FROM mcr.microsoft.com/dotnet/aspnet:7.0 AS Final
 RUN apt-get update && apt-get install -y \
   screen \
   libleveldb-dev \