tools: Add sha256sum check for detailed hint

Removing the Fedora fake as it seems to be not necessary. We later copy
the checksum from the release captains checksums anyway.
Also adding the sum check as it gives more details about which file did
not match if so.

Signed-off-by: Peter Neuroth <pet.v.ne@gmail.com>

tools/build-release.sh

@@ -323,10 +323,13 @@ if [ "$VERIFY_RELEASE" = "true" ]; then
         echo "Place it under the project root as \"$sumfile\"."
         exit 1
     fi
+    sumfile="$(pwd)/${sumfile}"
     cd release/
-    # Creating fake Fedora tar for SHA256SUMS match
-    # It is important for zipfile checksum match
-    touch clightning-v23.05-Fedora-28-amd64.tar.gz
+    # Check that the release captains sum matches. Ignore missing entries as we 
+    # do not have a repro build for Fedora. Strictly this is not necessary here
+    # as we compare our checksums with the release captains checksums later, but
+    # it gives a direct hint which specific checksums don't match if so.
+    sha256sum --check --ignore-missing "${sumfile}"
     # Creating SHA256SUMS
 	sha256sum clightning-"$VERSION"* > SHA256SUMS
 	# Replacing Fedora checksums from root file to release/SHA256SUMS