Enable .NET 7 workflows

.github/workflows/build-and-test.yml

@@ -20,20 +20,18 @@ jobs:
             sdk-preview: true
             runtime: -x64
             codecov: false
-          # Temp disabled due to runtime preview issues.
+          - os: macos-latest
-          # https://github.com/SixLabors/ImageSharp/issues/2117
+            framework: net7.0
-          #- os: macos-latest
+            sdk: 7.0.x
-          #  framework: net7.0
+            sdk-preview: true
-          #  sdk: 7.0.x
+            runtime: -x64
-          #  sdk-preview: true
+            codecov: false
-          #  runtime: -x64
+          - os: windows-latest
-          #  codecov: false
+            framework: net7.0
-          #- os: windows-latest
+            sdk: 7.0.x
-          #  framework: net7.0
+            sdk-preview: true
-          #  sdk: 7.0.x
+            runtime: -x64
-          #  sdk-preview: true
+            codecov: false
-          #  runtime: -x64
-          #  codecov: false
           - os: ubuntu-latest
             framework: net6.0
             sdk: 6.0.x