Refrain from using inplace substitution

Author: rvermeulen

scripts/release/test-data/release-layout.yml

@@ -14,4 +14,6 @@ layout:
     - shell: |
         shasum -a 256 ${{ layout.root }}/* > checksums.txt
         # Remove the layout root from the checksums.txt
-        sed -i '' -e "s|${{ layout.root }}/||g" checksums.txt
+        # We don't use inplace because of BSD vs GNU shenanigans
+        sed -e "s|${{ layout.root }}/||g" checksums.txt > checksums-rewritten.txt
+        mv checksums-rewritten.txt checksums.txt