ci: fix tag name for nightly json build (#489)

fix paritytech/resolc-bin#2

Author: alvicsam

.github/workflows/release-nightly.yml

@@ -136,7 +136,7 @@ jobs:
           export FIRST_SOLC_VERSION=$(./bins/resolc-x86_64-unknown-linux-musl --supported-solc-versions | cut -f 1 -d "," | tr -d ">=")
           export LAST_SOLC_VERSION=$(./bins/resolc-x86_64-unknown-linux-musl --supported-solc-versions | cut -f 2 -d "," | tr -d "<=")
           export FILEPATH=$(readlink -f data.json)
-          export TAG=$(cd revive;gh release list --json name,isLatest --jq '.[] | select(.isLatest)|.name')
+          export TAG=$(cd revive;gh release list --json name --jq '[.[] | select(.name | startswith("v"))][0].name')
           cd resolc-bin
           mkdir -p nightly
           cd nightly