Fix non-standard formatting of GitHub Actions context reference

The established convention is to pad the GitHub Actions context identifier in references.

In this workflow code, the right hand padding was missing.

Author: per1234

.github/workflows/release-go-crosscompile-task.yml

@@ -204,7 +204,7 @@ jobs:
           pattern: ${{ env.ARTIFACT_PREFIX }}*
 
       - name: Create checksum file
-        working-directory: ${{ env.DIST_DIR}}
+        working-directory: ${{ env.DIST_DIR }}
         run: |
           TAG="${GITHUB_REF/refs\/tags\//}"
           sha256sum ${{ env.PROJECT_NAME }}_${TAG}* > ${TAG}-checksums.txt