Fix linux build artifact name

Somewhere along the line, the variable used
for naming the .zip created for linux builds in
CI got messed up. Let's fix it, even if we're about
to disable creation of these in the next commit.

.github/workflows/cmake_ctest.yml

@@ -196,7 +196,7 @@ jobs:
     - name: Zip
       if: ${{ matrix.name == 'Linux' }}
       working-directory: ${{ env.ARTIFACTS_PATH }}
-      run: 7z a -tzip ${{ env.OUTPUT_FILEN }}.zip .
+      run: 7z a -tzip ${{ env.OUTPUT_FILENAME }}.zip .
 
     - name: Generate Installer (Windows) # and Sign with EV cert on Azure (Windows)
       if: ${{ matrix.name == 'Windows' }}
@@ -220,8 +220,8 @@ jobs:
       if: ${{ matrix.name == 'Linux' }}
       uses: actions/upload-artifact@v3
       with:
-        name: ${{ env.OUTPUT_FILEN }}.zip
-        path: '${{ env.ARTIFACTS_PATH }}/${{ env.OUTPUT_FILEN }}.zip'
+        name: ${{ env.OUTPUT_FILENAME }}.zip
+        path: '${{ env.ARTIFACTS_PATH }}/${{ env.OUTPUT_FILENAME }}.zip'
 
     - name: Upload DMG (MacOS)
       if: ${{ matrix.name == 'macOS' }}