Rename rapids-is-stable-build to rapids-is-release-build

Signed-off-by: Jordan Jacobelli <jjacobelli@nvidia.com>

tools/rapids-is-release-build

@@ -0,0 +1,17 @@
+#!/bin/bash
+# A utility script that examines environment variables provided by
+# GitHub Actions to determine whether the current build is a "release" build.
+# A "release" build occurs when the GITHUB_REF environment variable matches
+# the pattern "refs/tags/vYY.MM.PP".
+# Example:
+#    if rapids-is-release-build; then echo "hi"; fi
+set -e
+
+echo_prefix="    [rapids-is-release-build]"
+
+if [[ "${GITHUB_REF}" =~ ^refs/tags/v[0-9]{2}.[0-9]{2}.[0-9]{2}$ ]]; then
+  rapids-echo-stderr "${echo_prefix} is release build"
+  exit 0
+fi
+rapids-echo-stderr "${echo_prefix} is not release build"
+exit 1