Fix CI build for .NET 7 (#5)

* Set up .NET 7 during CI/CD.

* Fix the yaml typo

* Update .NET SDK in Dockerfile.

Author: dmytro-khmara

.github/workflows/build.yml

@@ -11,7 +11,11 @@ jobs:
     timeout-minutes: 15
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
+    - name: Set up .NET 7
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: '7'
     - name: Build
       run: docker build --target build .
     - name: Test

.github/workflows/publish.yml

@@ -7,7 +7,11 @@ jobs:
     timeout-minutes: 15
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
+    - name: Set up .NET 7
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: '7'
     - name: Set VERSION variable from tag
       run: echo "VERSION=${GITHUB_REF/refs\/tags\/}" >> $GITHUB_ENV
     - name: Build

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
 WORKDIR /source
 
 # copy csproj and restore as distinct layers