Added backward compatability for github workspace (#156)

Author: dcbickfo

go/lint/action.yml

@@ -57,7 +57,7 @@ runs:
         FLIPPCIRCLECIPULLER_REPO_TOKEN: ${{ inputs.FLIPPCIRCLECIPULLER_REPO_TOKEN }}
     - name: Setup safe directory
       shell: bash
-      run: git config --global --add safe.directory ${{ inputs.WORKSPACE }}
+      run: git config --global --add safe.directory ${{ inputs.WORKSPACE || github.workspace }}
     - name: Run Go linter
       uses: golangci/golangci-lint-action@v3
       with: