fix: Workflow Syntax

Author: Trevor Payne

.github/workflows/essentialsplugins-betabuilds.yml

@@ -229,7 +229,7 @@ jobs:
         shell: powershell
         run: |
           $nuspec_file = Get-ChildItem *.nuspec -recurse
-          ${{ env.NUSPECNAME }} = $($nuspec_file.BaseName)
+          echo "NUSPECNAME=$($nuspec_file.BaseName)" >> $GITHUB_ENV
           echo "NUSPEC_FILE=$($nuspec_file.BaseName)"| Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
       - name: Download Build Version Info
         if: ${{ env.NUSPECNAME != 'PDT.EssentialsPluginTemplate '}}

.github/workflows/essentialsplugins-releasebuilds.yml

@@ -177,7 +177,7 @@ jobs:
         shell: powershell
         run: |
           $nuspec_file = Get-ChildItem *.nuspec -recurse
-          ${{ env.NUSPECNAME }} = $($nuspec_file.BaseName)
+          echo "NUSPECNAME=$($nuspec_file.BaseName)" >> $GITHUB_ENV
           echo "NUSPEC_FILE=$($nuspec_file.BaseName)"| Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
       - name: Download Build Version Info
         if: ${{ env.NUSPECNAME != 'PDT.EssentialsPluginTemplate '}}