Add checksum computation to signing script

 + Remove signature file from the list of files to be signed.

sign-dist.sh

@@ -8,10 +8,14 @@ fi
 cd dist
 # File to signed
 # MEMO: -e: regexp, -v: not matched
-tobe_sig=$(ls | grep -e ".tar" -e ".zip" | grep -v ".sig")
+tobe_sig=$(ls | grep -e ".tar" -e ".zip" | grep  -v ".sha256" | grep  -v ".md5" | grep  -v ".sig")
 
 for element in ${tobe_sig}
 do
+  echo "Calculating checksum" ${element}
+  md5sum ${element} > ${element}.md5
+  sha256sum ${element} > ${element}.sha256
+
   echo "Signing" ${element}
   gpg --detach-sign ${element}
 done