reducing upgrade height to half an hour (#962)

.github/workflows/release.yml

@@ -31,7 +31,7 @@ jobs:
           # helper functions
           extract_txhash() { awk -F 'txhash: ' '/txhash:/{print $2; exit}'; }
           extract_proposal_id() { awk -F 'key: proposal_id|value: ' '/key: proposal_id/ { getline; gsub(/"/, "", $2); print $2; exit }'; }
-          extract_and_calc_upgrade_height() { awk -F'"latest_block_height":"' '{ split($2,a,"\""); print a[1]+900; exit }'; }
+          extract_and_calc_upgrade_height() { awk -F'"latest_block_height":"' '{ split($2,a,"\""); print a[1]+450; exit }'; }
           extract_checksum() { awk "/elysd-${{ github.ref_name }}-linux-amd64.tar.gz/ {print \$1; exit}"; }
 
           # environment variables