Tighten docs publishing flow (#12572)

docs/set-solana-release-tag.sh

@@ -3,25 +3,9 @@ set -e
 
 cd "$(dirname "$0")"
 
-if [[ -n $CI_TAG ]]; then
-  LATEST_SOLANA_RELEASE_VERSION=$CI_TAG
-elif [[ -z $CI_PULL_REQUEST ]]; then
-  LATEST_SOLANA_RELEASE_VERSION=$(\
-    curl -sSfL https://api.github.com/repos/solana-labs/solana/releases/latest \
-    | grep -m 1 tag_name \
-    | sed -ne 's/^ *"tag_name": "\([^"]*\)",$/\1/p' \
-  )
-else
-  # Don't bother the `api.github.com` on pull requests to avoid getting rate
-  # limited
-  LATEST_SOLANA_RELEASE_VERSION=unknown-version
-fi
-
-if [[ -z "$LATEST_SOLANA_RELEASE_VERSION" ]]; then
-  echo Error: release version not defined
-  exit 1
-fi
+eval "$(../ci/channel-info.sh)"
 
+LATEST_SOLANA_RELEASE_VERSION=$BETA_CHANNEL_LATEST_TAG
 VERSION_FOR_DOCS_RS="${LATEST_SOLANA_RELEASE_VERSION:1}"
 
 set -x