Simplify dotnet install versions lookup step

Author: kzu

.github/actions/dotnet/action.yml

@@ -8,27 +8,15 @@ runs:
       id: dotnet
       shell: bash
       run: |
-        # Try to read versions from .github/workflows/dotnet.json first
         if [ -f .github/workflows/dotnet.json ]; then
-          VERSIONS=$(jq -r '.[]' .github/workflows/dotnet.json | tr '\n' ',' | sed 's/,$//')
+          VERSIONS=$(jq -r '.[]' .github/workflows/dotnet.json)
         else
-          VERSIONS=$(gh api repos/${{ github.repository }}/properties/values | jq -r '.[] | select(.property_name == "DOTNET") | .value')
+          VERSIONS=$(gh api repos/${{ github.repository }}/properties/values | jq -r '[.[] | select(.property_name == "DOTNET") | .value] | join(",") | split(",")[] | gsub("^\\s+|\\s+$"; "")')
         fi
-        # Remove extra whitespace from VERSIONS
-        VERSIONS=$(echo "$VERSIONS" | tr -s ' ' | tr -d ' ')
-        # Convert comma-separated to newline-separated
-        NEWLINE_VERSIONS=$(echo "$VERSIONS" | tr ',' '\n')
-        # Validate versions
-        while IFS= read -r version; do
-          if ! [[ $version =~ ^[0-9]+(\.[0-9]+(\.[0-9]+)?)?(\.x)?$ ]]; then
-            echo "Error: Invalid version format: $version"
-            exit 1
-          fi
-        done <<< "$NEWLINE_VERSIONS"
         # Write multiline output to $GITHUB_OUTPUT
         {
           echo 'versions<<EOF'
-          echo "$NEWLINE_VERSIONS"
+          echo "$VERSIONS"
           echo 'EOF'
         } >> $GITHUB_OUTPUT