OSOE-396: Only run setup-dotnet if the image doesn't contain the same .NET version

.github/actions/setup-dotnet/action.yml

@@ -1,16 +1,16 @@
-name: Set up .NET
+name: Set up .NET
 description: Sets up the .NET SDK.
 
 inputs:
   dotnet-version:
     required: false
-    default: 6.0.*
+    default: 6.0.x
     description: Version of the .NET SDK to set up.
 
 runs:
   using: "composite"
   steps:
-    - name: Set environment variables
+    - name: Set Environment Variables 
       shell: pwsh
       run: |
         # This ceremony is needed to make the env vars available in subsequent steps too, see:
@@ -22,7 +22,11 @@ runs:
 
         "DOTNET_CLI_TELEMETRY_OPTOUT=true" >> $Env:GITHUB_ENV
         $Env:DOTNET_CLI_TELEMETRY_OPTOUT = "true"
+
+    # setup-dotnet won't install a version if it is already preinstalled on the VM. Note that it checks the latest
+    # released .NET version for wildcard versions. So, e.g. with 6.0.x specified it'll still install 6.0.402 if the VM
+    # only has 6.0.401. See: https://github.com/actions/setup-dotnet/issues/284#issuecomment-1276250960.
     - name: Set up .NET
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v3
       with:
         dotnet-version: ${{ inputs.dotnet-version }}

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

@@ -15,7 +15,7 @@ on:
       dotnet-version:
         required: false
         type: string
-        default: 6.0.*
+        default: 6.0.x
         description: Version of the .NET SDK to set up.
       build-directory:
         required: false

.github/workflows/build-dotnet.yml

@@ -15,7 +15,7 @@ on:
       dotnet-version:
         required: false
         type: string
-        default: 6.0.*
+        default: 6.0.x
         description: Version of the .NET SDK to set up.
       build-directory:
         required: false

.github/workflows/deploy-to-azure-app-service.yml

@@ -20,7 +20,7 @@ on:
       dotnet-version:
         required: false
         type: string
-        default: 6.0.*
+        default: 6.0.x
         description: Version of the .NET SDK to set up.
       build-directory:
         required: false

.github/workflows/publish-nuget.yml

@@ -16,7 +16,7 @@ on:
       dotnet-version:
         required: false
         type: string
-        default: 6.0.*
+        default: 6.0.x
         description: Version of the .NET SDK to set up.
       timeout-minutes:
         required: false

.github/workflows/test-analysis-failure.yml

@@ -16,7 +16,7 @@ on:
       dotnet-version:
         required: false
         type: string
-        default: 6.0.*
+        default: 6.0.x
         description: Version of the .NET SDK to set up.
       build-directory:
         required: false